The correct answer is A. Sasaram.
Sasaram is a city in the Indian state of Bihar. It is the headquarters of Sasaram district and is located on the banks of the Son River. The city is known for its historical importance, as it was the capital of the kingdom of Magadha during the time of the Buddha. Sasaram is also home to the tomb of Sher Shah Suri, the founder of the Sur Empire.
Tarka was a demon who was killed by Rama, the hero of the Ramayana. Tarka was the son of Ravana, the king of Lanka, and Mandodari. He was a powerful demon who had the ability to change his shape. Tarka challenged Rama to a battle, and Rama killed him with his bow and arrow.
The execution of Tarka took place in Sasaram. Rama had built a temple in Sasaram to commemorate his victory over Tarka. The temple is still standing today, and it is a popular tourist destination.
The other options are incorrect because they are not associated with the execution of Tarka. Bhojpur is a district in the Indian state of Bihar. Patna is the capital of the Indian state of Bihar. Purnia is a city in the Indian state of Bihar.