The resignation letter by a Judge of the Supreme Court is addressed to:

1. A

   The Chief Justice of India

   (a) The Chief Justice of India. This option claims that Supreme Court judges hand their resignation to the head of the judiciary. However, the Chief Justice does not receive these constitutional resignations.

2. B

   The senior-most Judge of the Supreme Court

   (b) The senior-most Judge of the Supreme Court. This option asserts that the seniormost colleague handles judicial exits. This is procedurally incorrect under Indian constitutional law.

3. C

   The President

   (c) The President. This option states that the resignation letter must be submitted to the President of India. According to Article 124(2) of the Constitution of India, a judge of the Supreme Court may resign their office by writing under their hand addressed to the President, making this the correct key.

4. D

   The Prime Minister

   (d) The Prime Minister. This option claims that the executive head of government receives judicial resignations. The Prime Minister has no constitutional role in accepting Supreme Court resignations.

Summary. Official key is (c) The President. The question asks for the authority who receives the resignation letter of a Supreme Court judge. Under Article 124(2) of the Constitution, judges submit their signed resignation directly to the President. Options (a), (b), and (d) incorrectly assign this executive function to the Chief Justice, a senior colleague, or the Prime Minister. Therefore, only option (c) is legally and constitutionally correct.