If Z is the seventh clown then Q must be the 8th clown. R must be first, because only Z could have gone before R.
A is wrong because only Z can normally go in front of R, but now Z is seventh.
B is wrong because now only R and W can go before T.
C is CORRECT. The only limit on W is that it cannot go before R. W can go anywhere from 2nd to 6th in this scenario.
D is wrong because now S, Y Z and W must go after V.
E is wrong because if Z goes seventh then Q goes eighth.
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