If someone is predisposed to a disease, they are more likely to contract the disease due to

If someone is predisposed to a disease, they are more likely to contract the disease due to Heredity (Option B)

Explanation: Heredity is the passing of characteristics from parents to the child/children. Characteristics like eye color etc. So, if either one of your parents have a disease there may chances that it may be passed onto you. There are chances that it may not happen but that are minimal chances. This is not random; it is also not affected by environmental factors.