Part A: Option B) He is trying to trick Ben
The Evidence is shown and explained in part B of the question.
Part B: Option D) "Tom gave up the brush with reluctance in his face, but alacrity in his heart. "
Reluctance means 'unwillingness or disinclination to do something', which means that Tom is making it look like he doesn't want to give the brush to him, but with alacrity in his heart which means cheerfulness.