marco grew up in a culture where he never saw anyone drink alcohol. he recently moved to a place where people drink. now he consumes a lot of alcohol. when asked why he drinks so much, he said it is because it makes him feel good. he feels a sense of relaxation and pleasure, he believes, because the alcohol triggers a release of neurotransmitters in his brain that relax him. if marco is right about why he drinks, what type of learning explains his drinking?