The correct answer is D. enforce new laws in the South. The problem was that there were still a lot of racially discriminatory laws in the south and a lot of social discrimination which made it difficult to enforce new laws,such as the prohibiton of racial discrimination of voting.
While the Marshall Plan was, in part, created to stop the spread of communism, the Molotov Plan was there to encourage it. Money from the Soviet Union could be used to prop up nascent communist states in a similar way that the money from the Marshall Plan was attempting to rebuild western-style democracies.
Ferries, trains, and planes