Match the following.

List-I	List-II
a. Age of 30	1. Hair thins and becomes gray
b. Age of 35	2. Decrease in immunity
c. Age of 40	3. Decreased hearing and wrinkling of skin
d. Age of 60	4. Lens stiffens and problem in focusing

A. a-4, b-1, c-2, d-3

B. a-4, b-3, c-2, d-1

C. a-1, b-4, c-2, d-3

D. a-3, b-4, c-2, d-1

Answer: Option A