Answer:
d. A variety of plant based foods
Explanation:
The important cancer risk factors for most Americans which are not using tobacco can be changed are body weight and diet.World Cancer Research Fund estimates that 20% approximately of all the cancers diagnosed in US are related to the body fatness, the physical inactivity, poor nutrition and excess of alcohol consumption.
Avoiding tobacco products, staying active, and eating healthy diet may reduce person's lifetime risk of cancer. The society suggests that a healthy diet which includes a lot of plant foods can help to prevent cancer.