The correct answer is (a). The Radcliffe Line is the border between India and Bangladesh. It was drawn by Sir Cyril Radcliffe, a British lawyer, in 1947, following the partition of India. The line was drawn in a hurry and without much consultation with the people who lived in the area. As a result, it left many people on the wrong side of the border. The Radcliffe Line has been a source of tension between India and Bangladesh ever since it was drawn.
Option (b) is incorrect. The border between India and Afghanistan is the Durand Line, which was drawn in 1893.
Option (c) is incorrect. The border between India and Nepal is the IndiaâNepal border, which was established in 1816.
Option (d) is incorrect. The border between India and China is the Line of Actual Control, which was established in 1962.