Assertlon(A): Almost all carbohydrates are optically active.
Reason (R): All carbohydrates have one or more chiral carbon atoms.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct but R is not the correct explanation of A.
(c) A is correct but R is wrong.
(d) A is wrong but R is correct.