Find out which part of a sentence has an error.(A) While she WAS returning /(B) from college, /(C) a ruffian attacked /(D) on her with a da…

Find out which part of a sentence has an error.
(A) While she WAS returning /(B) from college, /(C) a ruffian attacked /(D) on her with a dagger. /(E) No Error.