Suppose that a biochemist performs an experiment that indicates that the recommended daily allowance of Vitamin E (C29H50O2) should be doubled from 9.0 mg per day to 18.0 mg per day. The biochemist reports his results in a scientific journal.

Which of the following is a good question to ask about the experiment after reading the biochemist's conclusions?

On what group(s) of people did the biochemist perform his experiment?
Can Vitamin E be toxic to humans?
Is Vitamin E a fat-soluble or water-soluble substance?

A.
I, II, and III
B.
II only
C.
I only
D.
II and III

It would be necessary to ask from the scientist about the group of people on which he performed his experiment because it might be that certain other factor was the influence for the change in the requirement of Vitamin E, It might be that the people of that specific area or country might have a Vitamin E deficiency due to which there requirement was more for Vitamin E. Or there might be any other environmental or genetic factor influencing the change.