Statement (S) : Carbon dioxide produced as a result of cellular respiration combines with water to form carbonic acid that increases the blood pH. Reasons (R) : $CO_2$ must be eliminated from the body to maintain homeostatis.

Question

(1) (S) is not correct but (R) is correct

(2) (S) is correct but (R) is not correct

(3) Both (S) and (R) are correct, and (R) is not the correct explanation to (S)

(4) Both (S) and (R) are correct, and (R) is the correct explanation to (S)