Vitamin XYZ has long been a favorite among health food enthusiasts. In a recent large study, those who took large amounts of vitamin XYZ daily for two years showed on average a 40 percent lower risk of heart disease than did members of a control group. Researchers corrected for differences in relevant health habits such as diet. Which one of the following inferences is most supported by the passage? ["Taking large amounts of vitamin XYZ daily over the course of one's adult life should be recommended to most adults.", 'Health food enthusiasts are probably correct in believing that large daily doses of multiple vitamins promote good health.', 'Those who take large doses of vitamin XYZ daily for the next two years will exhibit on average an increase in the likelihood of avoiding heart disease.', 'Taking large amounts of vitamins is probably worth risking the side effects.']