The best title for the passage is （）

A．People taking 200 IU got bigger immune defenses than the ones who got only 60 IU.
B．Research has found Vitamin E delays the progression of Alzheimer's disease.
C．Most of us can get sufficient Vitamin E from diet.
D．It's important to remember when taking Vitamin E: more may not be better.

A．People will be in perfect health if they take Vitamin E every day.
B．Study showed that people who took Vitamin E regained their Flexibility.
C．Vitamin E may help prevent Alzheimer's.
D．Vitamin E offers a range of advantage if old people take proper dose of Vitamin E every day.