Identify the problem with the following sentence.

As Karen drove her Mustang up to the take-out window, it began to rattle.

A. wordiness

B. unclear meaning

C. wrong voice

The problem with the sentence, As Karen drove her Mustang up to the take-out window, it began to rattle is that it had B. unclear meaning. The use of the pronoun it did not define clearly the antecedent whether it is the take-out window or the Mustang she is driving.