Which of the following claims meets appropriate guidelines to be placed on the packaging of a supplement?
a. vitamin e prevents alzheimer's disease.
b. fish oil reduces risk of heart disease.
c. vitamin a prevents night blindness.
d. vitamin c enhances immune system function.

D

Explanation:

It is noted that vitamin C enhances immune system function.

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.