Which of the following is an example of stage directions?

A. Although he had never seen the ocean before, it somehow felt familiar.
B. A dusty office. MARA enters stage right and hesitates just before sitting down.
C. Roses are red,
Violets are blue,
Daisies are yellow,
And tulips are pink.
D. IAN. Where have you been?
SAM. Nowhere.