The answer is:
A. shame those acting foolishly or immorally
D. caution audiences or readers about foolish or immoral behavior
Satire is the use of humor, exaggeration or mockery to expose, criticize and indicate other people's flaws or stupidity in a disapproving manner, especially in politics and corruption. As a consequence, it makes something or someone appear ridiculous and makes the audience reflect on society's vices.
Churchill believes that an invasion of British soil is not likely to occur in the near future because the enemy would have to cross the heavily guarded sea to get there.
In his famous speech, "Their finest hour", given on 1940, Churchill said that for the Germans to cross the English Channel, they would need to have a large armada, that would be "intercepted long before it reaches the coast". There would be many obstacles in the way of an invading Navy, such as minefields, air bombings and the British Navy itself.
I would say C, because it makes the most sense without the context of the story. If not that one, then D makes sense as well.
It may be a hyperbole because it is exaggeration, it is not true there was absolutely nowhere to go, and nothing to buy, and no money to buy it with, and nothing to see outside the boundaries of Maycomb County.