The correct answer is A. Gaya.
Gaya is a city in the Indian state of Bihar. It is the headquarters of Gaya district and Gaya division. The city is located on the banks of the Phalgu River, about 100 kilometers (62 mi) south of Patna, the state capital. Gaya is one of the oldest cities in India, and is considered to be one of the seven sacred cities of Hinduism. The city is home to a number of important Hindu temples, including the Mahabodhi Temple, which is a UNESCO World Heritage Site.
The climate of Gaya is tropical, with hot summers and mild winters. The average temperature in Gaya ranges from 20 degrees Celsius (68 degrees Fahrenheit) in January to 38 degrees Celsius (100 degrees Fahrenheit) in May. The city receives an average annual rainfall of 1,200 millimeters (47 inches).
Gaya is a major tourist destination, and is known for its religious sites, as well as its historical and cultural attractions. The city is also a major commercial center, and is home to a number of industries, including textiles, food processing, and pharmaceuticals.
The other options are incorrect because they are not cities in Bihar.