Answer:
The British Empire will come to an end.
Step-by-step explanation:
From the passage, we can extract the following quotation: "...for without victory there is no survival. Let that be realized. No survival for the British Empire..."
In other words, Churchill is saying that if they lose the war, their entire country will be lost; it will fall to the hands of the Germans.
Now, look for an answer that describes the above situation: only the last choice "The British Empire will come to an end" correctly sums up the reason. Thus, that is the answer.
Hope this helps!