The correct answer is D. Patna.
The Patna High Court is the highest court of the Indian state of Bihar. It was established on 1 October 1916, and is located in Patna, the capital of Bihar. The court has jurisdiction over all civil and criminal cases arising in the state of Bihar.
The Patna High Court is a court of record, and its decisions are binding on all lower courts in the state. The court has a chief justice and 35 other judges. The chief justice is appointed by the president of India, and the other judges are appointed by the president on the advice of the chief justice of India.
The Patna High Court is a very important institution in the state of Bihar. It plays a vital role in the administration of justice in the state. The court is responsible for upholding the rule of law and ensuring that justice is done to all citizens of the state.
The other options are incorrect because they are not the locations of the Patna High Court. Option A, Bhagalpur, is a city in the state of Bihar. Option B, Darbhanga, is a city in the state of Bihar. Option C, Muzaffarpur, is a city in the state of Bihar.