Open skies plan of President Eisenhower hopes to have a unilateral agreement on arms control between nations. Although Germany rejected the proposal believing such policy is an espionage technique, the rejection made clear that the Soviet Union has been indeed having arms preparations. It is further verified by an approved espionage plane of the US.
Chamberlain's do nothing policy and make-nice attitude led to the invasion of both Czechoslovakia and also Poland. Hitler was emboldened to invade both countries when Neville Chamberlain came back from a meeting with Hitler and declared there would be 'Peace in our Time". He naively believed Hitler was not interested in conquest in Europe. Following the invasion of Poland, both France and the UK finally saw the truth of Hitler and declared war on Germany.
A.) Lack of education. To me still has a little to do with the problem but is better than any other choice out of the selection.
