What is the main idea of this passage from churchills speech?

The war will be long and challenging, but Britain will continue to fight.

Explanation:

britain never gave up even though germany would air raid london with bombs because britain focused on protecting it's citizens in air-raid bunkers and saved lives like the french General Charles de Gaulle who actually became president of france later on in life for saying men are harder to replace then war-equipment as the french made a desperate escape to dunkirk having minimal casualties.

answer; i believe that the correct answer is (c) ///

the correct answer on edgen is:

(c.) prevent the spread of communism.

i just took the test.