The Golghar, a historical granary, is a prominent landmark in:

The correct answer is: a) Patna.

The Golghar is a large granary located in Patna, India. It was built in 1786 by the British East India Company to store grain during famines. The Golghar is a prominent landmark in Patna and is a popular tourist destination.

The other options are incorrect because:

• Gaya is a city in the Indian state of Bihar. It is a major pilgrimage site for Hindus and Buddhists.
• Muzaffarpur is a city in the Indian state of Bihar. It is the headquarters of Muzaffarpur district.
• Nalanda is a town in the Indian state of Bihar. It was an ancient university that was once one of the most important centers of learning in the world.