The answer is C. Chamberlain.
Attlee, Bevin, and Churchill were all British Prime Ministers during World War II. Chamberlain was Prime Minister from 1937 to 1940, but he resigned after the Munich Agreement, in which he agreed to give part of Czechoslovakia to Germany in order to avoid war. Attlee became Prime Minister after Chamberlain’s resignation, and he led Britain through the war until 1945. Bevin was Foreign Secretary in Attlee’s government. Churchill was Prime Minister from 1940 to 1945, and again from 1951 to 1955. He is best known for his leadership during World War II, when he rallied the British people and helped to defeat the Nazis.
Chamberlain is the odd one out because he was not a wartime Prime Minister. He was Prime Minister during the Phoney War, the period of time between the outbreak of World War II in September 1939 and the German invasion of France in May 1940. Chamberlain’s policy of appeasement towards Germany failed to prevent war, and he was forced to resign after the Munich Agreement.