Question

which excerpt from hamlet, act i, scene i is a stage direction?
a platform before the castle
enter to him bernardo
bernardo: whos there?
francisco at his post

Explanation:

Stage directions describe the setting, actions, or entrances/exits of characters. "A Platform before the Castle" describes the setting. "Enter to him BERNARDO" is an entrance direction. "FRANCISCO at his post" describes a character's position. "Bernardo: Who's there?" is dialogue, not a stage direction.

Answer:

A. A Platform before the Castle, B. Enter to him BERNARDO, D. FRANCISCO at his post