The events aren’t showing- so maybe repost the question so i can help!
According to Eisenhower, Japan's trading business will be in danger if Communism expanded to Asia.
Japan relied on countries in South East Asia to buy their resources that they use in their production. If these countries (such as thailand, Indonesia, and myanmar) falls to communists, Japan will be imposed a heavy tariff to acquire their normal amount of materials.
I do believe the last statement is the answer to your question.
Enslaved Natives. Because at the time they were unaware that the natives didn't have immunity towards their diseases and were very unskilled at maintaining the crops the Spanish wanted.
It's answer B. You're welcome.