Match the following columns

Column I (Theory)	Column II (Scientist)
a. Substitution effect of a price change	1. Slutsky
b. Theory of rent	2. Keynes
c. Liquidity preference theory	3. Samnelson
d. Revealed preferency theory	4. Ricardo

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

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

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

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

Answer: Option A