what caused great britain and france to declare war on germany in 1939?\n the appeasement policy\n the…

what caused great britain and france to declare war on germany in 1939?\n the appeasement policy\n the invasion of poland\n the nonaggression pact\n the surrender of poland
Answer
Brief Explanations:
In 1939, Germany's invasion of Poland violated international treaties. As Poland had mutual - defense agreements with Britain and France, they declared war on Germany in response to this aggression. The appeasement policy was a pre - war approach, the non - aggression pact was between Germany and the Soviet Union, and the surrender of Poland happened after the war started.
Answer:
the invasion of Poland