Directions: Read each sentence to find out whether there is any grammatical or idiomatic error in it. In the following sentences, a part is highlighted in each sentence which is error-free, the error, if any, will be in any other part of the sentence. The letter of that part is the answer. If there is 'No error', the answer is (e). (Ignore errors of punctuation, if any). One of the student in the (A)/ advanced mathematics class consistently (B)/ **outperforms their peers,**/ showcasing exceptional (C)/ problem-solving skills.(D)

### Concept & Grammar Rule Noun Number with "One of the". The phrase "One of the" must always be followed by a plural noun, because you are selecting a single entity out of a larger group. ### Step-by-Step Solution - The sentence begins with the construction "One of the...". - This phrase indicates that one individual is being singled out from a multiple-member group. - Therefore, the noun following "One of the" must logically be plural. - In part (A), the noun "student" is singular. It must be corrected to the plural form "students". - The correct phrasing is "One of the students". ### Exam Strategy & Shortcut Scan for the phrase "One of the". If you see it, immediately verify that the next noun is plural and the subsequent main verb is singular (e.g., "One of the students is..."). ### Common Pitfall Confusing the singular subject "One" with the object of the preposition, leading to the incorrect use of a singular noun (e.g., saying "One of the student" instead of "One of the students"). ### Final Answer Therefore, the correct answer is **A**.