Match the List-I with List-II and select the correct answer:

List-I (Theories)	List-II (Scientists)
a. Unlimited supplies fraction of labour	1. Harris Todaro
b. Migration and unemployment theory	2. Arthur Lewis
c. Critical minimum effort	3. Rosenstein Rodan
d. Big push theory	4. Leibenstein

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

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

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

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

Answer: Option D