The correct answer is (c), Sir Creek.
The Thalweg principle is a legal principle that states that the boundary between two countries in a watercourse should follow the deepest part of the watercourse. India invokes the Thalweg principle regarding Sir Creek, which is a disputed border between India and Pakistan. The two countries have been unable to agree on the exact location of the border, and the issue has been referred to the International Court of Justice.
Kari Creek is a creek in India, while Kajhar Creek is a creek in Pakistan. Sir Davis is a mountain in Pakistan.