The Role of Physical Activity in the Prevention of Colon

The role of physical activity in the prevention of colon cancer is identified by which of the following?

A) It increases fluid loss leading to thirst and increased fluid intake, hydrating the colon.
B) It increases blood supply thereby increasing oxygen to the colon.
C) It increases gut motility thereby decreasing the time the bowel is exposed to mutagens.
D) It increases the secretion of hydrochloric acid thereby killing mutants.
E) Brain