The answer is D. I've done some research.
I think he assisted in developing NATO, which helped Western Europe rebuild after the war. He created the Marshall Plan, which provided economic support for war-torn regions. He helped stop the spread of communism in Western Europe.
D. Many new businesses and jobs were created
Sparta was at controlling helots, by murdering them, terrorizing them, brainwashing them and beating them into submission. When the Spartans dominance eroded and Greece fell to Rome, helots still did not get their freedom. Instead Of being slaves in Sparta, they became slaves in Rome