The Results of Research on Genetic and Environmental Factors Involved

The results of research on genetic and environmental factors involved in alcohol abuse find that ____.

A) genetic factors accounted for 56 percent of the risk of alcohol dependence
B) genetic factors accounted for 75 percent of the risk of alcohol abuse
C) genetic factors accounted for 55 percent of the risk of alcohol dependence while shared early environment made an 11 percent contribution to risk
D) genetic factors made no significant contribution to risk of alcohol dependence while early environment made accounted for 56 percent of the risk of alcohol dependence