Sentence Correction: Relative Clauses - One of the + plural noun + who/which/that

Autism is one of the neurological disorders that create confusion and parents are often unsure if their child is affected by such a developmental disability.

This answer choice incorrectly uses if when there is no condition present.

In the GMAT, If is used in Conditionals only; if one thing, ...then something else.

Whether is used as a choice between two possibilities dealing with the same subject or as a yes/no question.

Example: I do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

In the original sentence if is used when there is no condition present. In the GMAT, If is used in Conditionals only. Although this answer choice corrects the mistake by replacing if with whether, using or not after whether is redundant.

Although this answer choice correctly replaces if with whether since there is no condition present, it is grammatically incorrect. The relative clause that creates confusion describes the noun that appears immediately before it, namely, disorders. Since disorders is plural, the verb that follows it also needs to be plural. However, creates is singular.

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

Although this answer choice correctly replaces if with whether since there is no condition present, it is grammatically incorrect. The relative clause that create confusion describes the noun that appears immediately before it, namely, disorders. Since disorders is plural, the verb that follows it also needs to be plural. However, creates is singular.

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

Nice work!

This answer choice correctly replaces if with whether since there is no condition present in the original sentence.

create confusion and parents are often unsure if their child is affected by such a developmental disability
create confusion and parents are often unsure whether their child is affected by such a developmental disability or not
creates confusion and parents are often unsure whether their child is affected by such a developmental disability
create confusion and parents are often unsure whether their child is affected by such a developmental disability
creates confusion and often parents are unsure whether their child is affected by a developmental disability of this sort

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