Final answer:
Family history is a non-modifiable risk factor for colorectal cancer, whereas a high-fiber diet, regular exercise, and healthy weight are modifiable risk factors.
Step-by-step explanation:
Among the options provided, B. Family history is a non-modifiable risk factor for colorectal cancer. A high-fiber diet, regular exercise, and maintaining a healthy weight are considered modifiable factors that individuals can change to potentially reduce their risk of developing cancer. Family history, on the other hand, is a fixed factor that an individual has no control over. Studies have indicated that while many people believe dietary fiber does not impact the risk of colorectal cancer, there is evidence that it might actually decrease the risk by increasing the rate of passage of materials through the colon thus reducing exposure to carcinogens. However, when it comes to non-modifiable risk factors, genetics play a critical role, as those with a history of colorectal cancer in the family are at a higher risk.