In which sentence is a contrastive conjunction used incorrectly?

A. He might go for a run in the morning, yet he might prefer to exercise in the evening.

B. We should buy groceries today because we’re running out of food, or we can order takeout.

C. She must choose between studying for her exam or going out with her friends.

D. They could go skiing this weekend, so they should check the weather forecast beforehand.