The correct answer is option 3: 2 3 4 1.

To understand why this answer is correct, let`s look at the atomic power stations mentioned in List I and their positions on the map in List II:

A. Narora: This atomic power station is located on the map at position 2.

B. Rana Pratap Sagar: This atomic power station is located on the map at position 3.

C. Tarapur: This atomic power station is located on the map at position 4.

D. Kalpakkam: This atomic power station is located on the map at position 1.

So, the correct answer is option 3: 2 3 4 1, which correctly matches the atomic power station with their positions on the map.