The correct answer is C) He wants to give British citizens confidence that they can beat the Germans.
One of Churchill's main purposes when giving his speech was "He wants to give British citizens confidence that they can beat the Germans."
In the famous speech "Blood, Toil, Tears, and Sweet" of May 1940, in the House of Commons, he addressed the Parliament to form a government that put parties aside, forget differences and declare war to Germany.
Another great speech from Churchill was the "Finest Hour" in June 1940, in the House of Commons, where Churchill explained the Parliament the difficult situation after France had just capitulated and the Prime Minister insisted in the war with Germany.