PT 58 S4 Q10

Nutritionists believe that a person’s daily requirementfor vitamins can ... ...

Which one of the following statements, if true, most seriously weakens the argument?
(A) Even five servings of fruits and vegetables a day is insufficient unless the intake is varied to ensure that different vitamins are consumed.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Sept. '09 LSAT (PT 58 Sec. 4)