12.
A:
Indira Gandhi International Airport and Rajiv Gandhi International Airport
B:
Kempegowda International Airport and Chhatrapati Shivaji Maharaj International Airport
C:
Chennai International Airport and Netaji Subhas Chandra Bose International Airport
D:
Sardar Vallabhbhai Patel International Airport and Lokpriya Gopinath Bordoloi International Airport
The answer is: B