The source was from the time period and therefore is reliable. Furthermore, Source C is spoken by Neville Chamberlain, a politician who was directly involved with the situation in Czechoslovakia and debates what to do. In addition, Chamberlain attended the conference in Munich, making it a direct eyewitness account and more dependable. Contrastingly, Source C isn’t reliable as Chamberlain created appeasement himself, making him biased toward its success in 1938. The quote also comes from a speech during a parliamentary debate, making it’s purpose to persuade the public and other politicians that appeasement was a successful strategy and that the Munich Agreement could maintain peace. Likely, the source was used to reassure and persuade the public that there would not be a war. Many Britons were worried about another war due to the devastation of the first world war, and wanted peace to avoid losing their loved ones once again; Guernica had also been recently bombed by the Germans and this terrified the British public.
To conclude, I disagree with Chamberlain’s opinion that the Munich Agreement was a victory for peace, as while it did adjourn the war, the consequences were great, such as Hitler gaining more confidence and resources, and the Allies losing the USSR as a potential