The correct option is C 1939
On September 1, 1939, with the invasion of Poland by Germany marked the beginning of Second World War. This invoked a global conflict as Britain and France declared war on Nazi Germany by September 3, 1939. This war lasted from 1939 to 1945 involving 100 million people from over 30 countries. Two opposing military alliances namely Allies and the Axis powers were formed.