The correct answer is: a) Ludhiana.
Sahnewal Airport is a domestic airport located in Sahnewal, 11 kilometers (7 mi) from Ludhiana, Punjab, India. It is the second busiest airport in Punjab after Sri Guru Ram Dass Jee International Airport in Amritsar.
The airport was originally built in 1933 as a military airbase by the British Indian Army. It was later converted into a civil airport in 1962. The airport has one runway, which is 2,500 meters (8,200 ft) long and 45 meters (148 ft) wide.
The airport is served by Air India, IndiGo, SpiceJet, and Vistara. It offers flights to Delhi, Mumbai, Chennai, Kolkata, Bangalore, Hyderabad, Ahmedabad, and Jaipur.
The airport is located in the Ludhiana district of Punjab. Ludhiana is the second largest city in Punjab after Amritsar. It is a major industrial city and is known for its manufacturing of hosiery, bicycles, and agricultural machinery.
The other options are incorrect because:
- Amritsar is the largest city in Punjab and is located in the Amritsar district.
- Jalandhar is the third largest city in Punjab and is located in the Jalandhar district.
- Patiala is the fourth largest city in Punjab and is located in the Patiala district.