The answer is B. Profit was dependent on plantations and slave labor in South America
The United States did not directly engage in battle.
In order to answer this you need previously to know that by a proxy war:
by definition:
is an armed conflict between two states which act on instigating third parties, usually setting terrain where hostilities take place. there must be a direct, long-term relationship between external actors and the belligerent groups involved.
Clearly there was no direct fighting between Soviet and American troops, still, the mujahedeen were economically assisted and tactically aided by Us officers whereas, to the counterpart, the communist local government that was supporting assistance from the Soviet side also was given financial and military assistance. In this ideological confrontations, the external powers do not engage in open and direct warfare, rather, the intermediate or states in between are the terrain for the war to be carried.
Explanation:
In April 1881, McCarty was tried for and convicted of Brady's murder, and was sentenced to hang in May of that year. He escaped from jail on April 28, killing two sheriff's deputies in the process and evading capture for more than two months.