What is the MOST likely reason why many Americans were concerned with James K. Polk's manifest destiny efforts?

A) They feared that expanding the power of the states would threaten the supremacy of the federal government.

B) They feared that challenging European imperialism in Latin America would disrupt profitable trade relationships.

C) They feared that American Indians would acquire significant political power and influence over government policy.

D) They feared that efforts to acquire western territories would lead the country to war with other nations.