Mario ate a green mushroom, assuming it would give him a l-up. However, to his horror, it made him extremely sick the instant he ate it. Now Mario feels sick whenever he thinksof green mushrooms. This is because of a phenomenon referred to asMario also feels sick, but quite a bit less, when he thinks of other non-green mushrooms. This isbecause of a phenomenon known asa. Classical conditioning; Generalization gradientb. Conditioned disgust response; Discriminationc. Conditioned disgust response; Generalization gradientd. Phobia; Discrimination