A protective tariff is taxing a foreign good to protect it from foreign theft. Tariff means tax, and protection means what it sounds like, so all together it means a protective tax
This would be called a trade-of B.
The reason why this is correct is because if you can only build one thing as a company and you decide that building war equipment is more important to you, then you're doing a trade-off between building butter-making machines and army tanks.
Maybe you could make a POV of a boy who was in it! :)
C--he worked to end isolationist policy--FDR did not do anything with foreign policy during his first 100 days.
FDR would maintain the isolationist policy in his first two terms as president. He signed Neutrality Acts through 1937. In his third term (elected in 1940), he began moves toward war preparing the US for World War II.