Read the excerpt from "Object Lesson, Part 2."

“We have twenty-eight minutes." He raised his voice, smiling. "Naturally the thief has ditched the money, hoping to recover it when the coast is clear. It's therefore hidden somewhere in the classroom. All right, Miss Carpenter, we'll take the desks and seats first. Look under them, too — chewing gum makes a handy adhesive. Eh, class?"

What implication does Ellery make?

that the students want to listen, but they cannot hear him over all the activity in the room
that the thief will recover the money during first period while everyone is still in the room
that Miss Carpenter will help him carry the desks and chairs out of the classroom
that the thief may have stuck the stolen money to the underside of a gum-covered seat