The correct answer is: a) Rajgir.
Rajgir is a hill station in Bihar, India. It is known for its scenic beauty and its historical importance. The city is located in the Rajgir hills, which are part of the Himalayas. Rajgir is a popular tourist destination, and is home to a number of temples, monasteries, and parks.
Bodh Gaya is a town in Bihar, India. It is the site of the Mahabodhi Temple, which is a UNESCO World Heritage Site. The temple is considered to be the holiest site in Buddhism, as it is the place where the Buddha attained enlightenment.
Muzaffarpur is a city in Bihar, India. It is the second largest city in the state, after Patna. Muzaffarpur is a major commercial and industrial center. The city is also home to a number of educational institutions.
Nalanda is a town in Bihar, India. It was the site of a major Buddhist university from the 5th to the 12th centuries. The university was one of the most important centers of learning in the world at the time.
In conclusion, the correct answer to the question “A popular hill station in Bihar, known for its scenic beauty, is:” is a) Rajgir.