Many people feel that hard work deserves a reward. However, this is not true.
Hard work should be its own reward, because such work intrinsically gives the
worker satisfaction when it is performed satisfactorily.
The author of the argument draws his or her conclusion by

A. Claiming than what is commonly believed is false for that very
reason.
C. Challenging the definition of the word "reward" as something
extrinsic to a task.
E. Allowing a counterclaim to weaken his or her argument.

OA after some discussion!