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

List-I (Instrument)	List-II (Measuring quantity)
a. Ammeter	1. Pressure
b. Hygrometer	2. Weight
c. Spring balance	3. Electric current
d. Barometer	4. Relative humidity

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

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

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

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

Answer: Option B