Recent research has demonstrated a correlation between the presence of certain types of gram-positive bacteria in the human gut with obesity and type 2 diabetes. these findings best support which of the following statements?

a.) normal microbiota may significantly impact human health and disease.

b.) the presence of gram-positive bacteria in the human gut causes obesity and type 2 diabetes.

c.) gram-positive bacteria compose the majority of normal microbiota in the human gut of people with obesity and type 2 diabetes.

d.) obesity and type 2 diabetes is caused by normal microbiota in the human gut.