The correct answer is C) They wanted to protect U.S. business and political investments.
The United States become involved in South and Central American affairs because they wanted to protect U.S. business and political investments.
Central and South America always have been priorities for the U.S. government because are important issues on security, economy, and politics. To help with the diplomatic relations, a special organization for Latin America issues was created in 1948: the Organization of American States (OAS), where the U.S. foreign policy focus on protecting business and political investments.