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A sociological study of medical students, conducted in 2001, reveals that many of the reasons respondents cited for choosing a career in medicine stem from early childhood perceptions of what it means to be a 'good doctor'.
This answer choice is grammatically incorrect. The article much can describe only non-count nouns whereas reasons is a count noun.[[snippet]]
This answer choice is grammatically incorrect. The singular verb stems does not agree with the plural article many (of the reasons ...).
What helps us identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:
x of y subject
This answer choice is grammatically incorrect; it makes incorrect use of the Present Progressive tense (are stemming) to describe a generalization or a fact. The correct tense here would be Present Simple.
While this answer choice is grammatically correct, it is stylistically flawed. The phrase much of what respondents cited as reasons is wordy and redundant.
This answer choice makes correct use of the article many to describe a count noun reasons.