Match the following columns

Column I	Column II
a. When MP is increasing	1. TP increase at an increasing rate
b. When MP is decreasing but more than zero	2. TP increase at an decreasing rate
c. When MP is zero	3. AP is increasing
d. When MP is more than AP	4. TP is at its maximum stage

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

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

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

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

Answer: Option D