A. The U.S. used its power to control it's Central America and Cuba in order to benefit its own government and businesses.
This statement is the most important to include in an accurate and objective summary of the article as it highlights the main theme of the article, which is how the United States increased its control over its neighbors in Central America and the Caribbean Sea in order to benefit its own government and businesses. The other options mention specific actions taken by the U.S. but do not encapsulate the overall aim of the article which is the U.S.'s expansionist policies.