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In each set below, two of the sentences are punctuated correctly. Your job is to pick out the one sentence that is not correctly punctuated.
A.
The new clerk the one with floppy shoes and a red rubber nose is a real clown.
B.
The new clerk , the one with floppy shoes and a red rubber nose , is a real clown.
C.
The new clerk -- the one with floppy shoes and a red rubber nose -- is a real clown.