15 People who took vitamin E were no less likely to have a heart attack than those taking the placebo.
(A) People who took vitamin E were more likely to have a heart attack than those taking the placebo.
(B) People who took the placebo were less likely to have a heart attack than those taking vitamin E.
(C) People who took vitamin E and people who took the placebo had the same likelihood of getting heart attack.
(D) Not all the people who took vitamin E and the placebo were less likely to have a heart attack.