In Which One of the Following Ways Are Students Most

In which one of the following ways are students most likely to benefit from knowing the instructional objectives of a lesson?

A) Objectives let them know what questions are going to be on the next exam.
B) Objectives enable them to predict how their teacher will teach the lesson,so they won't be caught by surprise if the lesson goes in an usual direction.
C) Objectives give them a good idea of what their grades are going to be.
D) Objectives tell them what is expected of them and so can help them direct their efforts.