At graduation, the speaker assured us that our many
courses in the liberal arts had prepared us equally well
for the challenges of working and further study.
(A) had prepared us equally well for the challenges of
working and further study
(B) had prepared us equally well for the challenges of
work and of further study
(C) has supplied the preparation for challenging work
along with further study
(D) leaves us prepared for the challenges of
work and further study both
(E) were the preparation for making the challenges of
work or further study easier

The provided statement has a parallelism mistake. The noun "work" should be used instead of "working," as the two elements united by "and" should be parallel. Option B fixes this issue without creating any other ones.

There is a parallelism mistake in Option (A). The noun "work" should be used instead of "working," as the two elements united by "and" should be parallel. Choice (C) has an agreement mistake. Our numerous liberal arts courses are a plural topic, thus the singular verb "has supplied" is incongruous.

Choice (D) has an agreement mistake. Our numerous liberal arts courses are a plural topic, thus the singular word "leaves" does not make sense. Choice (E) uses awkward language. It should be "prepared us for," rather "were the preparation for making."

Here's another question with an answer similar to this about parallelism:

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