Question

what saved many british and french forces from the germans in 1940?
the bombing of pearl harborthe battle of the atlanticthe evacuation of dunkirkthe destroyers for bases agreement

Explanation:

The Evacuation of Dunkirk (Operation Dynamo) in 1940 was a military operation where Allied forces (including British and French troops) were evacuated from the beaches and harbour of Dunkirk, France. This was crucial as it saved a large number of Allied soldiers from being captured by the German forces. The bombing of Pearl Harbor occurred in 1941. The Battle of the Atlantic was a long - running naval campaign (1939 - 1945). The Destroyers for Bases agreement was in 1940 but it was about the U.S. providing destroyers to the UK in exchange for base rights, not directly related to saving the troops in France.

Answer:

the Evacuation of Dunkirk