Vignette Donna Is a 22-Year-Old College Student on the Tennis

Vignette Donna is a 22-year-old college student on the tennis team. She prides herself on staying in shape but often eats empty-calorie meals when she is in a rush. She knows that some family members have had different kinds of cancer and is curious to find out what steps, if any, she can reduce her risks. She visits a reputable site on the Internet and gleans several useful suggestions that she plans on implementing. Let's see if you agree with her new found information.
The National Cancer Institute estimates that only about 15 percent of all cancers are associated with ____.

A) genetics and related risk factors
B) lifestyle factors
C) environmental factors
D) dietary factors
E) occupation-related factors