Which fallacy is being committed in the following?

"I read with great interest your presentation on how the human body actually requires a certain amount of sunlight despite the trend to constantly wear sunscreen. I am going to disagree with you unless you can tell me how you were able to make that presentation despite the fact that there were not supposed to be any more presentations after 6:00!"

A. Circular Reasoning.
B. Red Herring.
C. Appeal to Force.
D. Equivocation.