Fact 1: Some viruses can cause cancer. Fact 2: Cancer is an uncontrolled growth and spread of abnormal cells. Given the two facts above, what can cause an uncontrolled growth and spread of abnormal cells?

OPTIONS: a. smoking cigarettes b. some foods c. Pesticides d. cigarettes e. smoking f. some religions g. some viruses h. some books
The answer is:
g.