The writer is considering changing the underlined portion of sentence 13 (reproduced below) to ensure that the sentence is free of ambiguity.

Dismayed by the lack of rigor and by irresponsible labeling practices in the mass-market probiotics industry, stronger regulation of probiotic supplements is called for by Cohen.

Which version of the underlined text best accomplishes this goal?

(A) (as it is now)

(B)probiotic supplements should be regulated more strongly, according to Cohen

(C)what should be done according to Cohen is that probiotics should be regulated more strongly

(D) Cohen calls for stronger regulation of probiotic supplements

(E) supplements—probiotic ones, to be exact—require stronger regulation, claims Cohen

The second part of the sentence is in the passive voice, which means the subject is not the performer of the action. That makes the first part of the sentence become a dangling modifier, since now we do not know who is "dismayed by the lack of rigor..."

Therefore, the sentence is ambiguous. To change that, we must make it clear that Cohen is the one dismayed about all that and who calls for stronger regulation. Thus, we need the second part of the sentence to be in the active voice.

With the in mind, we can change the sentence by using option D. This is the new, corrected sentence: "Dismayed by the lack of rigor and by irresponsible labeling practices in the mass-market probiotics industry, Cohen calls for stronger regulation of probiotic supplements."

Learn more about ambiguity here:

https://brainly.com/question/1114764