Sentence Correction (SC) | Re: Executives and federal officials say that the use of crack a

Executives and federal officials say that the use of crack and cocaine is growing rapidly among workers,significantly compounding the effects of drug and alcohol abuse, which already are a cost to business of more than $100 billion a year.

(A) significantly compounding the effects of drug and alcohol abuse, which already are a cost to business ofcost to business sounds awkward imo

(B) significantly compounding theeffects of drug and alcohol abuse, which alreadycost business

(C) significantly