Which of the Following Individuals Would Be MOST at Risk

Which of the following individuals would be MOST at risk for developing alcoholism?

A) Shirley, whose identical twin, Fran, is an alcoholic
B) George, whose fraternal twin, Sam, is an alcoholic
C) Linda, whose adoptive mother, Gail, is an alcoholic
D) Adam, whose father, Ben, is an alcoholic
E) Sheila, whose mother, Sally, is a problem drinker