Who will get the most benefit from a vitamin b12 supplement?

a. reproductive-age females who eat meat, fish, and vegetables every day
b. someone who eats little or no animal proteins
c. men who eat fish, meat, and vegetables every day
d. someone who consumes too many calories

The correct option is B.
Vitamin B12 are a set of  water soluble related substances, which are very important for the proper functioning of some body enzymes and they are usually found together in the same food. Foods that are rich in Vitamin B12 include:meat, fish, poultry, egg and dairy. Some people who are vegetarians and who do not eat these kind of food will benefit greatly from taking vitamin B12 supplement. 

True. the more you know, the better of you will be.