Which sentence correctly uses a modal verb and a contrastive conjunction?

A. They might go hiking if the weather is good, or they might stay home and watch a movie.

B. She should finish her homework, so she might go out with her friends afterward.

C. We can’t go to the beach because it’s raining, but we could go to the museum instead.

D. He must study for the test because it’s important, yet he might still fail.