Match the stage in List-I with achievement in List-II.

List-I	List-II
a. Sensory motor stage	1. Centration
b. Preoperational stage	2. Object permanence
c. Concrete operations	3. Test hypothesis
d. Formal operations	4. Conservation of numbers
	5. Formation

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

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

C. a-3, b-4, c-2, d-5

D. a-2, b-1, c-4, d-5

Answer: Option A