The answer to this question is D. Colon
According to popular belief, Most medical workers think that the colon does not possess any form of digestive system.
But, Recent research shows that several test subjects actually could absorb energy from starch and nonstarch polysaccharides from their colon
A limited blood supply and slow metabolism
Mitochondria...
Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. The biochemical processes of the cell are known as cellular respiration.
Its first rest, then everday activity and then strength training or stretching, and then aerobic activity.
So your answer is C.