The moment he set foot in the room he knew he had walked in on a catastrophe.

Louise Carpenter stood tensely straight at her desk, her pretty face almost as white as the envelope she was clutching. And she was glaring at a mass of boy and girl faces so blankly, so furtively quiet that the silence sizzled.

—"Object Lesson,"
Ellery Queen

Which detail would most likely help you make a prediction about what is going on?

Ellery Queen’s entrance into the room
the blank faces of the students
the color of Miss Carpenter’s envelope
Miss Carpenter’s glare at the students