Find out which part of a sentence has an error.(A) I don't know /(B) if any of the members /(C) of the party is conspiring /(D) against the…

Find out which part of a sentence has an error.
(A) I don't know /(B) if any of the members /(C) of the party is conspiring /(D) against the President or not. /(E) No Error.