A.I. Explanation:

Correct answer: marked

Explanation: The word 'marked' fits grammatically as it is the past participle used in a passive construction, indicating that the economic growth is characterized by an increase in income per capita. This aligns with the context of the sentence, which discusses economic growth and its correlation with income.

Meaning: 'Marked' means to be noticeable or significant, indicating that the increase in income per capita is a clear feature of the economic growth observed.

Wrong options:

• made: 'Made' implies creation but does not convey the sense of significance or correlation needed in this context.
• created: 'Created' suggests the act of bringing something into existence, which does not fit the passive structure of the sentence.
• compared: 'Compared' implies a comparison between two entities, which does not align with the intended meaning of indicating a characteristic of economic growth.

Correct answer: The use of

Explanation: 'The use of' is the correct phrase as it specifies a particular action or concept, fitting grammatically and contextually to introduce the subject of telephones, televisions, and computers. It indicates a general reference to the act of using these devices.

Meaning: 'The use of' refers to the act of utilizing something, in this case, telephones, televisions, and computers by people.

Wrong options:

• A use of: 'A use of' suggests a singular instance, which does not fit the context of discussing the general increase in usage.
• The use for: 'The use for' implies purpose rather than the act of using, which does not match the intended meaning here.
• A use for: 'A use for' also implies a singular purpose, which is not appropriate in the context of general usage.

Correct answer: better developed

Explanation: 'Better developed' is the correct form as it uses the comparative adjective 'better' with the past participle 'developed,' indicating that the infrastructure has improved over time. This fits grammatically and contextually within the sentence structure.

Meaning: 'Better developed' means that the infrastructure has been improved to a higher standard or level than before.

Wrong options:

• developed better: 'Developed better' incorrectly places the adverb after the verb, which disrupts the intended meaning of improvement in infrastructure.
• developing better: 'Developing better' suggests an ongoing process rather than a completed action, which does not fit the context of the sentence.
• better developing: 'Better developing' is grammatically incorrect as it does not properly convey the completed state of development.

Correct answer: tend to

Explanation: 'Tend to' is the correct phrase as it indicates a general tendency or inclination, fitting grammatically and contextually to describe the behavior of less economically developed countries. It aligns with the plural subject 'countries.'

Meaning: 'Tend to' means to have a tendency or inclination towards something, in this case, being agricultural countries.

Wrong options:

• have tended to: 'Have tended to' implies a completed action in the past, which does not fit the present context of describing a general tendency.
• tends: 'Tends' is singular and does not agree with the plural subject 'countries.'
• tending to: 'Tending to' is not a correct form in this context, as it does not convey the intended meaning of a general tendency.