Sentence Correction (SC) | Re: Because paper of all kinds is the biggest single component

(A) Because paper of all kinds is the biggest single component of municipal trash, many municipalities have tried recycling to reduce the cost of trash disposal. --- Best choice.

(B) Because paper of all kinds is the biggest single component in municipal trash, many municipalities tried to recycle so that the cost of trash disposal is reduced. -- Correct Sv pair, 'component in' is wrong. Also using past tense changed the meaning of it.

(C) Because paper of all kinds are the biggest single components
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