No one in Rohan's immediate family has cancer. What does this MOST likely mean?

A. He will never get cancer
B. His mom does not have cancer-causing genes
C. His dad does not have cancer-causing genes
D. He could possibly get cancer

D. He could possibly get cancer.

The fact that no one in Rohan's immediate family has cancer does not guarantee that he will never get cancer. There could be other genetic or environmental factors at play that could increase his risk of developing cancer.