Match the items of the List-I with that of the List-II and suggest the correct answer from the following.

List-I	List-II
a. Cost function	1. Kinked demand
b. Supply function	2. Isoquants
c. Production function	3. Engineering method
d. Oligopoly	4. Factor prices

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

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

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

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

Answer: Option D