D. The US would intervene in Latin American affairs when it felt its interests were at risk.
Explanation:
Latin America is vital for the security of the United States. The foreign powers residing in Latin America is Communist. After World War II, the threat of communist expansion left the United States to form a policy toward foreign powers in Latin America that it would interfere in the affairs of Latin America if they felt any threat to the security or interests being at risk.
An example of such an intervention by the US in Latin America is Guatemala in 1954.
