If the mood were imperative, Mrs. Lopez would be ordering the students to discuss poetry.
B
If the mood were revised to subjunctive, Mrs. Lopez would be asking if the students were going to discuss poetry today.
C
If the mood were revised to indicative, Mrs. Lopez would be saying that the students would be discussing poetry today, even though she knew it wasn’t true.
D
If the mood were revised to imperative, Mrs. Lopez would be noting that the students had discussed poetry in the past.