The Qila Mubarak is an important historical fort located in:

The correct answer is: a) Patiala.

The Qila Mubarak is an important historical fort located in Patiala, Punjab, India. It was built in the 16th century by the Bhatti Rajputs. The fort is a rectangular structure with four gates. The main gate is called the Hathi Gate. The fort is surrounded by a moat. The fort has several buildings, including a palace, a mosque, and a temple. The fort is a popular tourist destination.

The other options are incorrect because:

• Bathinda is a city in Punjab, India. It is located about 200 kilometers from Patiala.
• Amritsar is a city in Punjab, India. It is located about 250 kilometers from Patiala.
• Ludhiana is a city in Punjab, India. It is located about 100 kilometers from Patiala.