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