The correct answer is (a) Radcliffe line.
The Radcliffe Line is the border between India and Pakistan that was established in 1947, following the partition of India. The line was drawn by Sir Cyril Radcliffe, a British lawyer, and was based on religious demographics. The Radcliffe Line was controversial, and there were many protests and riots along the border in the years following its creation.
The Durand Line is the border between Afghanistan and Pakistan. It was established in 1893 by Sir Mortimer Durand, a British diplomat. The Durand Line is not recognized by Afghanistan, and there have been many disputes over the border in recent years.
The McMahon Line is the border between India and China. It was established in 1914 by Henry McMahon, a British diplomat. The McMahon Line is not recognized by China, and there have been many disputes over the border in recent years.
The Siegfried Line was a defensive line built by Germany along its western border in the 1930s. The Siegfried Line was not a border between two countries, but it was a major obstacle to the Allied advance during World War II.