In Terms of the Genetic Influences for Becoming an Alcoholic,it

In terms of the genetic influences for becoming an alcoholic,it has been shown that

A) most offspring of alcoholics become so themselves.
B) the enzyme necessary for breaking down alcohol is not present in alcoholic individuals.
C) the brains of alcoholics contain a gene that influences the sensitivity of dopamine receptors to alcohol.
D) alcoholics have a specific abnormality on chromosome 10.
E) the concordance rate for monozygotic twins is generally higher than it is for dizygotic twins.