Personally, I think the correct answer is B. It is important to vary activities often to avoid becoming too tired or bored with one same activity. Rewarding yourself upon completing a certain part is also relevant because you will be giving yourself incentive to continue working more.
The correct answer to the question above is (b.) death. In Morte d'Arthur, the black hoods worn by the ladies who come to take King Arthur away on the barge are used to symbolize death.
