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 of

Meaning error : 'Drug & alcohol abuse are a cost to business of more than $100 billion a year'
'of' phrase incorrectly modifies business &
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