Question

the tragedy of hamlet, prince of denmark
act i. scene i.
francisco stands guard in front of the castle in elsinore, denmark. another guard, bernardo, enters to take over the watch
elsinore. a platform before the castle.
francisco at his post. enter to him bernardo.
bernardo: whos there?
francisco: nay, answer me; stand, and unfold yourself.
bernardo: long live the king! (5)
francisco: bernardo?
bernardo: he.
francisco: you come most carefully upon your hour.
bernardo: tis now struck twelve; get thee to bed, francisco.
francisco: for this relief much thanks; tis bitter cold. (10)
and i am sick at heart.
bernardo: have you had quiet guard?
francisco: not a mouse stirring.
bernardo: well, good-night.
if you do meet horatio and marcellus. (15)
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 are instructions for actors/setting, not dialogue. "Enter to him BERNARDO" tells of Bernardo's entrance (a stage action), while others are either setting (A is part of scene setting but the option here is the phrase, and A's full setting is "Elsinore. A Platform before the Castle" but the option is just "A Platform...", C and D are dialogue. So "Enter to him BERNARDO" is a stage direction.

Answer:

B. Enter to him BERNARDO.