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Sentence Correction: Subject Verb Agreement - A Pseudo-Plural Singular Subject

Microeconomics study how individuals, households and firms make decisions to allocate limited resources, typically in markets in which goods or services are being bought and sold.

Incorrect.

This answer choice is grammatically incorrect. The singular subject Microeconomics does not agree with the plural verb study.

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Well done!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb study to the singular verb studies, to match the singular subject Microeconomics

[[snippet]]

This answer choice repeats the original mistake. The singular subject Microeconomics does not agree with the plural verb study.

[[snippet]]

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it is stylistically flawed. Adding the word their creates redundancy.

Incorrect.

This answer choice repeats the original mistake. The singular subject Microeconomics does not agree with the plural verb study.

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study how individuals, households and firms make decisions
study how individuals, households and firms decide
studies how individuals, households and firms make decisions
studies how individuals, households and firms make their decision
study decisions of individuals, households and firms