The correct answer is A) Kempegowda International Airport, Bengaluru.
Kempegowda International Airport is the main international airport serving the Indian city of Bengaluru, capital of the state of Karnataka. It is located in Devanahalli, about 40 kilometres (25 mi) north of the city centre. The airport is named after Kempe Gowda I, the founder of Bengaluru.
The airport is the busiest airport in the state of Karnataka and the fourth busiest airport in India. It is also the largest airport in India in terms of area. The airport has two terminals, Terminal 1 and Terminal 2. Terminal 1 is used for domestic flights, while Terminal 2 is used for international flights.
The airport is served by a number of airlines, including Air India, IndiGo, Jet Airways, SpiceJet, and Vistara. The airport also has a number of cargo airlines, including Air India Cargo, Blue Dart Aviation, DHL Aviation, and FedEx Express.
The airport is connected to the city of Bengaluru by a number of roads, including the Outer Ring Road, the National Highway 44, and the Bangalore-Mysore Road. The airport is also connected to the city by a number of public transport options, including the Metro, the bus, and the taxi.
The airport is a major economic hub for the state of Karnataka. It is a major source of employment for the state and it also generates a significant amount of revenue for the state government. The airport is also a major tourist attraction for the state.
The other options are incorrect because they are not the main gateway for tourists to Karnataka.
Option B, Mangaluru International Airport, is located in Mangaluru, a city in the state of Karnataka. The airport is a major domestic airport and it also serves a number of international destinations. However, it is not the main gateway for tourists to Karnataka.
Option C, Chhatrapati Shivaji Maharaj International Airport, is located in Mumbai, a city in the state of Maharashtra. The airport is the busiest airport in India and it serves a number of international destinations. However, it is not the main gateway for tourists to Karnataka.
Option D, Indira Gandhi International Airport, is located in Delhi, the capital of India. The airport is the busiest airport in India and it serves a number of international destinations. However, it is not the main gateway for tourists to Karnataka.