user
A man leaves home, runs for a little bit and turns left.  Runs some more, and turns left again.  He runs a bit more and turns left one more time.  When he comes back home he sees two men in masks waiting for hom.  Who are the masked man?
A: witness
B: boundary
C: athletes
D: catcher and umpire
E: player
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

D

<|end_of_solution|>