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

List-I	List-II
a. Earthquake	1. Ammeter
b. Altitude (Height)	2. Seismograph
c. Electric current	3. Altimeter
d. Resistance	4. Ohm

a. Earthquake → 2. Seismograph
A seismograph is an instrument used to detect and record seismic vibrations and waves produced by earthquakes.

b. Altitude (Height) → 3. Altimeter
An altimeter is an instrument used to measure the altitude or height of an object above a reference level, usually mean sea level.

c. Electric current → 1. Ammeter
An ammeter is an instrument used to measure the electric current flowing through a circuit. The SI unit of electric current is the ampere (A).

d. Resistance → 4. Ohm
The ohm (Ω) is the SI unit of electrical resistance. Resistance is the opposition offered by a conductor to the flow of electric current.

Thus, the correct matching is a-2, b-3, c-1, d-4.

Hence, Option A is the correct answer.