Mark the letter A, B, C, or D to indicate the sentence that best completes each of the following exchanges.
Lan: “What can government do to punish factories that violate environmental law?”
Nam: “_________.”
A. So many of them are polluting the environment.
B. Yes, I think a big fine would be relevant.
C. They may force those factories to close down.
D. There are no factories in this region.