Which justification did US officials give for sending troops to aid an unpopular government in Vietnam?

a. defending civilians against human rights violations

b. preventing the spread of communism

c. protecting American business interests

d. stopping ethnic cleansing in Cambodia

The answer is

(B: Preventing the spread of communism.)

B) Preventing the spread of communism

The role of the united state in Vietnam war began after the world warII. US mission was to restrict the communist domination that was present in Vietnam government, this was because communism could easily spread to the Neighbouring countries which would result to a change in the balance of power throughout Southeast Asia.