Question

the attack upon korea makes it plain beyond all doubt that communism has passed beyond the use of subversion to conquer independent nations and will now use armed invasion and war. it has defied the orders of the security council of the united nations (set to preserve international peace and security). in these circumstances the occupation of formosa by communist forces would be a direct threat to the security of the pacific area and to united states forces performing their lawful and necessary functions in that area.
-president truman, 1950
what concerns truman about the events on the korean peninsula? check all that apply.
communists use of subversive tactics
the use of armed forces to spread communism
the threat of a communist invasion of taiwan (formosa)
north koreas defiance of un orders
the potential for instability in the pacific area

Explanation:

• The text mentions that communism has moved from subversion to armed invasion (so the use of armed forces to spread communism is a concern).
• It also states that North Korea (implied by the context of the attack on Korea) has defied the orders of the UN Security Council (so North Korea's defiance of UN orders is a concern).
• The occupation of Formosa (now Taiwan) by Communist forces would be a direct threat to the Pacific area (but the option is about the threat of a Communist invasion of Taiwan (Formosa) which is not explicitly in the text. However, the text does mention the concern about Communist actions related to Formosa in the context of the Pacific area security. Also, the potential for instability in the Pacific area is related as the text says the attack on Korea and related Communist actions (like potential issues with Formosa) are threats to the Pacific area).
• The text says communism has passed beyond subversion (so communists' use of subversive tactics is not the current concern as they have moved to armed invasion).

Answer:

B. the use of armed forces to spread communism, D. North Korea's defiance of UN orders, E. the potential for instability in the Pacific area