With companies spending large parts of their advertising budgets onlin

The list of creators, "by a professional writer, a blogger, and by individual users"
violates the principle of parallelism in two ways. First, while "a professional writer" and
"a blogger" are singular, the third element in the list, "individual users," is plural.
Second, the word "by" introduces the first and third elements in the list ("by a
professional writer . . . by individual users") but not the second element in the list ("a
blogger"). To create a parallel sentence, the word "by" should introduce the entire list
and should not be repeated. In addition to the parallelism problem, the subject of the
underlined portion is the singular "market" which does not agree with the plural verb
phrase "are expanding."
(A) This choice is incorrect as it repeats the original sentence.
(B) This choice fails to resolve the subject-verb agreement issue, as the singular
"market" does not agree with the plural verb phrase "are expanding." In addition, this
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choice fails to maintain parallel structure because the word "by" introduces the first
and third elements in the list of creators ("by professional writers . . . by individual
users") but not the second element ("bloggers"). To create a parallel sentence, the
word "by" should introduce the entire list and should not be repeated.
(C) This choice has proper subject-verb agreement since the singular "market"
agrees with the singular verb phrase "is expanding." However, the list of 3 types of
creators is not written in parallel form. While "a professional writer" and "a blogger"
are singular, the third element in the list, "individual users," is plural.
(D) The phrase "created by professional writers, bloggers, and individual users" lists
elements in parallel form. However, this choice fails to resolve the subject-verb
agreement issue, as the singular "market" does not agree with the plural verb phrase
"are expanding."
(E) CORRECT. The phrase "created by professional writers, bloggers, and individual
users" lists elements in parallel form. Each element in the list is plural and the entire
list is introduced by the word "by" which is correctly not repeated. In addition, the
singular subject "market" agrees with the singular verb phrase "is expanding."