Answered

The incident that finally led Britain and France to declaring war on Germany was the German invasion of
a) France
b) Czechoslovakia
c) Sudetenland
d) Poland



Answer :

the correct answer is d): Poland. Britain and France declared war on Germany on 3rd September 1939, after Germany attacked Poland two days before. France did this, because it previously had an agreement with Poland that it would if Poland gets attacked by Germany.