Match the following.

List-I (Thinker)	List-II (Principle)
a. Henry Fayol	1. Careful design of jobs with ten efficient work methods
b. Elton Mayo	2. Unity of direction
c. FW Taylor	3. Organisational equilibrium
d. Chester I Barnard	4. Social factors and group norms

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

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

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

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

Answer: Option A