Cats spend much of their time sleeping; they seem to awaken only to stretch and yawn. Yet they have a strong, agile musculature that most animals would have to exercise strenuously to acquire.
Which one of the following, if true, most helps to resolve the apparent paradox described above?

A. Cats have a greater physiological need for sleep than other animals.
B. Many other animals also spend much of their time sleeping yet have a strong, agile musculature.
C. Cats are able to sleep in apparently uncomfortable positions.
D. Cats derive ample exercise from frequent stretching.
E. Cats require strength and agility in order to be effective predators.

The conclusion is cats sleep all the time, barring for stretching and yawning, yet have agile, strong musculature. So, we have to find the answer option which connects stretching with development of musculature. D directly calls that out.