Topics: Conditionals and Modal Verbs

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A: Is this pen yours? I found it under the desk.
B: No, it’s not mine. Maybe it’s hers.
A: I asked her already. She said it wasn’t hers. Could it be his?
B: Let’s ask John. If it’s not his, then maybe it’s theirs.

What is the main idea of the dialogue?

A. Returning a lost pen to its owner.

B. Buying a new pen for the class.

C. Sharing school supplies.