Explanation
Solution
The sentence provided in the question contains a grammatical error regarding the usage of the phrase "one of the."
1. The Rule of "One of the":
In English grammar, the phrase "one of the" is always followed by a plural noun. This is because you are picking one individual out of a group of many.
2. Identifying the Error:
In the original sentence, "She was one of the average student...", the word "student" is singular. To be grammatically correct, it must be changed to the plural form "students".
Evaluation of Options:
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Option(1): Correctly uses the plural noun "students" after "one of the."
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Option(2): Incorrectly uses the singular "student."
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Option(3): The phrase "one among the" also requires a plural noun, but it uses the singular "student."
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Option(4): The article "an" is used with a singular noun, but "students" is plural, making this option logically and grammatically incorrect.
Correct Option: 1