Answer:
She should remind him of the rules for discussion and ask him to provide supporting information.
Well, we can eliminate B because there are very few plays where they read out the stage directions. This play just by reading it wouldn't be one of them. So, B is now eliminated.
C can be eliminated too. The volume seems to stay calm throughout all of the passage.
D I feel we can eliminate too.
Therefore A is your best answer.
Hope this helps!
