Match List-I (Confederations) with List-II (Duration) and select the correct answer from the options given below the lists:

List-I (Confederation)	List-II (Duration)
a. German Confederation	1. 1991 - Continuing
b. Swiss Confederacy	2. 1815 - 1866
c. American Confederacy	3. 1781 - 1789
d. Commonwealth of Independent States	4. 1815 - 1840

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

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

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

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

Answer: Option C