A.I. Explanation:

Correct answer: depleted

Explanation: The word 'depleted' fits grammatically as it is the past participle form of the verb 'deplete,' which describes the state of the Colorado River as having been significantly reduced in quantity. This aligns with the context of discussing the river's current condition due to overuse and climate factors.

Meaning: 'Depleted' means reduced in quantity or diminished, particularly in reference to resources.

Wrong options:

• idea: 'Idea' is a noun that does not fit grammatically or contextually as it does not describe a state of being for the river.
• diluted: 'Diluted' refers to a reduction in concentration, which does not accurately describe the river's condition in this context.
• fact: 'Fact' is a noun that does not fit grammatically as it does not describe the river's state.
• exacerbated: 'Exacerbated' is a past participle that describes an action rather than a state, making it unsuitable here.
• conducted: 'Conducted' is a verb that implies carrying out an action, which does not relate to the river's condition.

Correct answer: fact

Explanation: The term 'fact' is a noun that serves as the subject of the clause, indicating a reality or truth about the situation regarding water extraction from the river. It fits grammatically and contextually as it introduces the reason for the depletion.

Meaning: 'Fact' refers to a statement that can be proven true or false, in this case, the reality of water extraction.

Wrong options:

• idea: 'Idea' is a noun that suggests a thought or concept, which does not fit as it does not convey a concrete reality in this context.
• depleted: 'Depleted' is an adjective that describes a state rather than a reason or explanation, making it unsuitable here.
• diluted: 'Diluted' is an adjective that describes a condition rather than a factual statement, which does not fit the context.
• exacerbated: 'Exacerbated' is a verb that describes an action rather than a fact, making it inappropriate in this context.
• conducted: 'Conducted' is a verb that implies carrying out an action, which does not relate to the factual nature of the statement.

Correct answer: exacerbated

Explanation: The word 'exacerbated' is the past participle of the verb 'exacerbate,' meaning to make a problem worse. It fits grammatically as it describes how climate change has intensified the effects of the megadrought, aligning with the context of the sentence.

Meaning: 'Exacerbated' means to make a situation worse or more severe, particularly in reference to the effects of climate change on the drought.

Wrong options:

• idea: 'Idea' is a noun that does not fit grammatically or contextually as it does not describe an action or condition related to the drought.
• depleted: 'Depleted' is an adjective that describes a state rather than an action, making it unsuitable here.
• diluted: 'Diluted' refers to a reduction in concentration, which does not accurately describe the relationship between climate change and the drought.
• fact: 'Fact' is a noun that does not fit grammatically as it does not describe an action or condition in this context.
• conducted: 'Conducted' is a verb that implies carrying out an action, which does not relate to the worsening of the drought.