The Challenges Our Bodies Face in Defending Cells Against Mutations

The challenges our bodies face in defending cells against mutations include all the following except

A) some are more severe than the body can fix.
B) the frequency of the encounter with the carcinogen can overwhelm the body's defenses.
C) the body's defenses become inactive in response to the carcinogen.
D) in some people other features of their DNA diminish their body's ability to protect and repair cells.