Which statement best supports the argument that eating whole grains is good for you?
A On the other hand, vegetables such as
spinach, broccoli, and peppers are non-
starchy and can be great to eat.
B Limiting sugar in the blood is important
because too much sugar can cause
obesity and other diseases, such as
diabetes.
C A carbohydrate that takes longer to
break down in the body puts less sugar
into your bloodstream.
D Of course, exercise helps the body work
off calories and sugar that you might
get from eating too many
carbohydrates.

C) a carbohydrate that takes longer to break down in the body puts less sugar into your bloodstream

Explanation:

Whole grains are a more complex carbohydrate than your basic white bread, meaning it takes longer to break down and doesn't flood your bloodstream with sugar the way white bread does when eaten. (also, the other three are not very closely related to/answer the question)

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.