GMAT Sentence Correction (SC) | Re: Cautioning against taking excessively high doses of certain vitamins a

Cautioning against taking excessively high doses of certain vitamins and minerals, Americans are being warned by nutritionists.

(A) Cautioning against taking excessively high doses of certain vitamins and minerals, Americansare being warned by nutritionists.(Passive tense is not preferable)
(B) Nutritionists are cautioning Americans against taking excessively high doses of certain vitamins and minerals.(Correct)
(C) Cautioning against taking doses of certain vitamins and minerals that are too
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