A.I. Explanation:

Correct answer: transitioning

Explanation: The word 'transitioning' is a gerund that fits grammatically as it describes the action of moving from one state to another, which is relevant to the context of societies changing from nomadic to settled lifestyles.

Meaning: Transitioning refers to the process of changing from one state or condition to another.

Wrong options:

• highlighted: 'Highlighted' is a past participle that does not convey the action of change and does not fit the context of societal evolution.
• spanning: 'Spanning' implies covering a range but does not indicate the process of change necessary in this context.
• covered: 'Covered' suggests something being concealed or protected, which does not relate to the concept of societal transition.
• traced: 'Traced' refers to following back to an origin, which does not fit the action of changing lifestyles.
• crossed: 'Crossed' indicates movement across boundaries but does not relate to the transition of societies.
• arranging: 'Arranging' implies organizing or putting in order, which does not fit the context of societal change.

Correct answer: spanning

Explanation: The term 'spanning' is a gerund that indicates the duration of tea's history, fitting grammatically and contextually as it describes the extensive time frame over which tea has existed.

Meaning: Spanning means extending across a certain period or range.

Wrong options:

• transitioning: 'Transitioning' refers to a process of change, which does not fit the context of describing the duration of tea's history.
• highlighted: 'Highlighted' is a past participle that does not convey the idea of duration and is not appropriate here.
• covered: 'Covered' suggests protection or concealment, which does not relate to the concept of time span.
• traced: 'Traced' implies following back to an origin, which does not fit the context of duration.
• crossed: 'Crossed' indicates movement across boundaries, which does not relate to the time aspect of tea's history.
• arranging: 'Arranging' implies organizing, which does not fit the context of describing a historical duration.

Correct answer: traced

Explanation: The word 'traced' is a past participle that fits grammatically as it indicates the action of following the origins of tea back to China, aligning with the context of historical discovery.

Meaning: Traced means to follow back to an origin or source.

Wrong options:

• transitioning: 'Transitioning' refers to a process of change, which does not fit the context of identifying origins.
• highlighted: 'Highlighted' is a past participle that does not convey the action of discovering or following back to origins.
• spanning: 'Spanning' refers to duration, which does not relate to the action of tracing origins.
• crossed: 'Crossed' indicates movement across boundaries, which does not fit the context of tracing origins.
• covered: 'Covered' suggests protection or concealment, which does not relate to the act of tracing.
• arranging: 'Arranging' implies organizing, which does not fit the context of following back to origins.

Correct answer: crossed

Explanation: The term 'crossed' is a past participle that fits grammatically as it describes the action of tea moving across borders, which is relevant to the context of its spread into various regions.

Meaning: Crossed means to move from one side to another, particularly across boundaries.

Wrong options:

• transitioning: 'Transitioning' refers to a process of change, which does not fit the context of movement across borders.
• highlighted: 'Highlighted' is a past participle that does not convey the action of crossing or movement.
• spanning: 'Spanning' implies covering a range but does not indicate the action of crossing borders.
• traced: 'Traced' refers to following back to an origin, which does not fit the context of crossing borders.
• covered: 'Covered' suggests protection or concealment, which does not relate to the action of crossing.
• arranging: 'Arranging' implies organizing, which does not fit the context of movement across borders.