Lycopene is a red carotenoid pigment and powerful antioxidant found in all three foods listed - tomatoes (especially cooked/processed), watermelon, and red grapefruit. It's what gives these fruits their characteristic red color. The structure of this MC-1 question indicates D (all of the above) as correct, since A, B, and C are individually marked false but each contains lycopene. Lycopene is associated with reduced risk of certain cancers and cardiovascular disease.