A major pilgrimage center for both Hindus and Jains is:

Bodh Gaya
Sasaram
Pawapuri
Munger

The correct answer is a) Bodh Gaya.

Bodh Gaya is a major pilgrimage center for both Hindus and Buddhists. It is located in the Indian state of Bihar, about 100 kilometers south of Patna. The town is home to the Mahabodhi Temple, which is a UNESCO World Heritage Site. The temple is said to be the site where the Buddha attained enlightenment.

Sasaram is a city in the Indian state of Bihar. It is located on the banks of the Son River, about 100 kilometers from Patna. The city is home to a number of historical and religious sites, including the tomb of Sher Shah Suri, the founder of the Sur Empire.

Pawapuri is a town in the Indian state of Bihar. It is located about 100 kilometers from Patna. The town is home to the Mahaparinirvana Temple, which is a UNESCO World Heritage Site. The temple is said to be the site where the Buddha attained Mahaparinirvana, or final nirvana.

Munger is a city in the Indian state of Bihar. It is located on the banks of the Ganges River, about 100 kilometers from Patna. The city is home to a number of historical and religious sites, including the tomb of Sher Shah Suri, the founder of the Sur Empire.

In conclusion, the correct answer is a) Bodh Gaya.