Match List-I with List-II and select the correct answer by using the options given below:

List-I (Author)	List-II (Title)
a. C. W. Mills	1. The ruling class
b. Vilfredo Pareto	2. Iron Law of Oligarchy
c. Gaetano Mosca	3. The Power Elite
d. Roberto Michels	4. Circulation of Elites

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

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

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

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

Answer: Option D