Match List-I (Pollutants) with List-II (Sources) and select the correct answer:

List-I	List-II
a. Petroleum and industrial hydrocarbons	1. Vehicles
b. Airborne lead	2. Offshore wells, oil tankers, industrial wastes
c. Mercury	3. Plastic industries
d. Polychlorinated biphenols	4. Industrial operations

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

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

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

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

Answer: Option C