OFFICIAL EXPLANATION
The word foible is a minor character weakness or the weaker section of a sword.A. is a minor character weakness or
This answer choice is illogical. The subject of the sentence is The word foible, not foible.
It is incorrect to say a word or a term is the same thing as what it refers to. Therefore, it is wrong to say that The word foible is something or other, but rather, The word foible refers to/describes/defines something or other. In this case it refers to/defines/describes a minor character weakness or the weaker section of a sword.
What helps us identify this mistake in the original sentence is the following Stop Sign: The word/term... (it) is...
Whenever we see this Stop Sign, we know that the topic that the question checks is pronouns, specifically using refers to/defines/describes after the word/term (and not is).B. can be used to describe either a minor character weakness nor
Although this answer choice corrects the Pronoun error in the original sentence by using can be used to describe instead of is, it is grammatically incorrect. Either must be followed by or, not nor.
What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign: (n)either... (n)or...C. can be used to describe either a minor character weakness or
In this answer choice, either is correctly complemented by or, and both are followed by a noun: either is followed by the noun weakness, and or is followed by the noun section. Also, this answer choice corrects the Pronoun error in the original sentence by using can be used to describe instead of is.D. can be used either to describe a minor character weakness or
This answer choice is grammatically incorrect. The same part of speech that follows either must also follow or. In this answer choice, either is followed by the to+verb to describe. Or, however, is followed by the noun section.
What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign: (n)either... (n)or...E. can be used either to refer to a minor character weakness or
This answer choice is grammatically incorrect. The same part of speech that follows either must also follow or. In this answer choice, either is followed by the to+verb to refer. Or, however, is followed by the noun section.
What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign: (n)either... (n)or...