If the question says 'Write NO MORE THAN TWO WORDS AND/OR A NUMBER', then writing 'three students' (2 words) is:
AAcceptableCORRECT
BToo many words
CToo few words
DAlways wrong
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Why the answer is A, and why the others tempt you.
2 words is within the limit. Always read the word-limit instructions carefully; exceeding them = automatic wrong.
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