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Sentence Correction: Parallelism - not only A but also B

In numerous political accounts, the definition most commonly used to describe a strong leader is that of a person who is cognizant of but undeterred by the fluctuations of public opinion.

Incorrect.

This answer choice is illogical and stylistically flawed. By changing is that of a person to is a person, this answer choice states illogically that the definition is a person. However, a definition cannot be a person, it can be of a person.

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In addition, the words that is are redundant, as they are not needed to convey the meaning.

Incorrect.

This answer choice is grammatically incorrect and illogical. By changing is that of a person to is a person, the corrected sentence states illogically that the definition is a person. However, a definition cannot be a person, it can be of a person.

[[snippet]]

In addition, by changing cognizant of to cognizant, this answer choice creates a grammatical mistake, as idiomatically the adjective cognizant requires the preposition of.

Incorrect.

This answer choice is grammatically incorrect. Idiomatically, the adjective cognizant requires the preposition of, but in this answer choice the preposition of is omitted.

Incorrect.

This answer choice is grammatically incorrect. The phrase but also must be complemented by not only.

Stop Sign: not only A but also B

In addition, the words that is are redundant, as they are not needed to convey the meaning.

Well done!

This answer choice makes correct use of the preposition of after cognizant. It also is the most concise of all the answer choices.

most commonly used to describe a strong leader is that of a person who is cognizant of but
that is most commonly used to describe a strong leader is a person who is cognizant of but
most commonly used to describe a strong leader is a person who is cognizant but
most commonly used to describe a strong leader is a that of a person who is cognizant but
that is most commonly used to describe a strong leader is that of person who is cognizant of but also