I will go for D also

A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.
Which of the following hypotheses is best supported by the evidence above?

A. The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.

B. Vitamin C is helpful in preventing disease.

C. Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.

D. Massive doses of vitamin C can help to prevent serious case of flu.

E. A balanced diet contains less than 250 mg of vitamin C



??????? I was going over questions I did in Gmatter last night.







Origanlly last night the answer was C, now today it says the answer is D???

What gives?

C for me.
Deducible from the arg...

C is wrong because the reduction of 25% doesnt mean that the incidence of flu is reduced from 34 to 9%. It means that it is reduced 25%. so 34%-(34*.25) = 25.5%. This contradicts the arguments findings of 9%.

Tricky question. I changed my mind twice.

For me the answer is D.
C is incorrect because when the incidence is 34% for normal dosage, a 25% reduction will mean 34% - 25% of 34% , which is 25.5%

It could either be C or D.

You're right on the "25% decrease" is only 25% of 34%, not a 25% absolute drop.

But who says that 1,500 is a 'massive' dose. Massive is far too ambiguous. Massive to me would be like 15,000 ...

Don't worry about it - move on to the next one

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
Not shown by the text
(B) Vitamin C is helpful in preventing disease.
Not proven
(E) A balanced diet contains less than 250 mg of vitamin C.
Not shown by the text

So between C and D.

I think D has a problem, because we have not defined what we can call massive dose.

So answer has to be C.

I think it's D

C sounds beautiful, but 25% of 32 is not less than 9%, therefore is wrong.
Please correct me if i am wrong.

the only possible answers could be b/w C and D. D says "massive"doses..we don't know what a massive dose is. moreover, we don't know if taking vit C helps prevent..we know that it reduces...anyway C is wrong in that taking vit C doesn't reduce of 25%..we would have a 75%decrease...so OA is D

Hi,
I was lured by B that talk about preventing disease, not about case of flu, damn it.
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