Answer: D. He prioritized preparing the military for a possible war with Mexico.
Explanation: This statement is true, as Polk was willing to risk a war with Mexico to achieve his goal of acquiring California and New Mexico. He sent troops to the border area and declared war on Mexico after a skirmish.
The other statements are false, as:
A. The resources needed to maintain all of the territory was more than he would
This statement is false, as Polk did not seem to be concerned about the costs of maintaining the new territories. He was more focused on fulfilling his expansionist vision.
B. He genuinely feared the power of the British military.
This statement is false, as Polk did not show any fear of the British military. He was ready to fight for the Oregon Territory if Britain did not agree to his terms.
C. The U.S. did not have the funds to purchase Oregon from England.
This statement is false, as Polk did not try to purchase Oregon from England. He negotiated a treaty that divided the territory between the two countries.