In an Experiment in Which Both People with Alcoholism and Social

In an experiment in which both people with alcoholism and social drinkers were informed that they were drinking either alcoholic or nonalcoholic beverages,the crucial factor in how much they drank was ________.

A) whether they suffered from alcoholism or were social drinkers
B) their expectations about what they were drinking
C) whether they actually drank alcohol or not
D) their ages and socioeconomic backgrounds