The correct answer is B) The United States promised to protect Latin America from European interference in part to improve trade with Latin American countries.
The following economic concern contributed to the creation of the Monroe Doctrine: The United States promised to protect Latin America from European interference in part to improve trade with Latin American countries.
Under the presidency of James Monroe, specifically in 1923, the US President delivered an important speech warning European superpowers to never interfere with the Latin American nations. This was the principle known as the Monroe Doctrine, in which the United States made clear to Europeans that any intervention in Latin America would be interpreted as aggression to the United States.