Match List-I with List-II and select the correct answer using the options given below:

List-I (Equation)	List-II (Relation between/Description)
a. Continuity equation	1. Relates diffusion constant with mobility
b. Einstein's equation	2. Relates charge density with electric field
c. Poisson's equation	3. Relates flow with rate of change of concentration in space
d. Diffusion equation	4. Rate of change of minority carrier density with time

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

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

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

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

Answer: Option B