Why do people with inherited high cancer-risk mutations develop cancer at an earlier age?
a. People with inherited high cancer-risk mutations actually develop cancer at older ages than people with non-heritable forms of cancer.
b. Usually only one mutation is needed to develop cancer.
c. People with inherited cancer-risk mutations are born with cancer, but it takes a while to notice.
d. People who have inherited high-risk mutations start life with at least one predisposing mutation, so they require fewer additional mutations.
e. People with inherited cancer-risk mutations also tend to be more exposed to carcinogens.