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During his career, Carl Lewis won ten Olympic medals and, in doing so, convinced the International Olympic Committee to name him "Sportsman of the Century".
This answer choice is grammatically incorrect. A pronoun (in this case, it) refers to a previously mentioned noun. If we wish to refer to a previously mentioned verb (won ten Olympic medals), we need to use the phrase to do so or doing so.
What helps us identify this question as a Pronoun question is the following Stop Sign:
Any pronoun in the underlined part or after it.
Although this answer choice is grammatically correct, it is stylistically flawed. Changing the sentence from active to passive creates Redundancy. Since there is another grammatically correct answer choice that doesn't use the passive form, it is preferable to this one.
Active (more concise): Carl Lewis won ten Olympic medals.
Passive (less concise): Ten Olympic medals were won by Carl Lewis.
This answer choice is grammatically correct, and stylistically flawed. The use of the plural pronoun they to refer to the singular noun committee is incorrect. Furthermore, changing the second half of the sentence from active to passive makes it awkward and creates Redundancy.
This answer choice is grammatically correct, and stylistically flawed. The use of the plural pronoun theyto refer to the singular noun committee is incorrect. Furthermore, phrase they should give him the name of is wordy and creates redundancy.
This answer choice correctly uses the phrase doing so to refer to a previously mentioned verb (won ten Olympic medals). It is also the most concise of the answer choices.