Answer :
The police of Appeasement is most famously referred to the fact that Hitler was allowed to keep Czechoslovakia in the hope that this will satisfy his greed. This was not the case, and because of this appeasement came to be seen as a failure. (3)
Invasion of Czechoslovakia (1939) caused the policy of appeasement to be viewed as a failure. Option 3 is correct.
Appeasement was the policy of making political or material concessions to the dictatorial and aggressive powers with the purpose of staving off conflict, governed Anglo-French foreign policy during the 1930s. It became indelibly associated with Conservative Prime Minister Neville Chamberlain.
The term appeasement is generally applied to the foreign policy of the British governments of Prime Ministers Ramsay MacDonald, Stanley Baldwin and Neville Chamberlain towards Nazi Germany and Fascist Italy between 1935 and 1939.
