Imagine this scenario: Physical activity reduces the risk of Type II Diabetes (T2DM) more so among adults with a family history of T2DM when compared to adults without a family history of T2DM. However, if our sample of adults with a family history of T2DM was also more likely to be obese, what is obesity in this example?

A. Modifier

B. neither a modifier or a confounder

C. confounder