Which of the following sentences is INCORRECT？A．The test questions are kept secret so as t

Which of the following sentences is INCORRECT？

A．The test questions are kept secret so as to prevent cheating.

B．In order to prevent cheating, the test questions are kept secret.

C．They started early in order to get there in time.

D．So as to get there in time, they started early.

请帮忙给出正确答案和分析，谢谢！