Please help me Read this excerpt from a play.

(The scene reveals a school auditorium in Anytown, USA. The lights begin to dim. Students slide to the front of their chairs, craning their necks toward the stage. All eyes work to refocus in the dim light. Sounds of movement can be heard from behind the curtain. A muffled cymbal is heard, as though an instrument has been bumped in the shuffle.)

NARRATOR: May I have your attention please?

JUAN: (He is seated in the middle of a crowded row, and he leans to speak to his friend.) I wish they would just come on, already.

KEV: (whispering) They introduce this show the same way every year.

Which setting detail best reveals the mood of suspense?

The scene reveals a school auditorium in Anytown, USA.
Students slide to the front of their chairs, craning their necks toward the stage.
Sounds of movement can be heard from behind the curtain.
He is seated in the middle of a crowded row, and he leans to speak to his friend.