Answer:
A) The US feared European aggression would harm Americans!
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The correct answer is D) regarded the southern states as conquered territory.
Following the Civil War, the Radical Republicans in Congress regarded the southern states as conquered territory.
Radical Republicans in Congress did not agree with President Lincoln's plans to reunite the country as quickly as possible. President Abraham Lincoln wanted a quick Reconstruction process and gave leeway to the Southern states to do their own Reconstruction process and only demanded the application of the 10th percent Plan, issued on December 8, 1863. So the attitude of the radical Republicans following the Civil War was that the Southern States had been conquered and should be punished by their actions.
Taxation without representation, the colonists were taxed by the British without the Colonists own government being consulted. Another reason was the that the British did not allow the Colonists to move into the newly aquired area of the northwest region(Ohio, Kentucky etc.), because the British promised the area to the Native Americans. And may I note the Colonists actually considered themselves to be British.
The correct answer to this open question is the following.
Although you did not specify the time in history or any specific context, we are going to assume that you are referring to the US imperialistic role through history.
Being that the case, we can comment on the following.
The foreign policy actions of the United States reflect selfish, imperialist ambitions since the times of President James Polk and the Manifested Destiny. He expanded the US territory acquiring the Mexican northern states after the Mexican-American War.
Since those years, passing through the times of President Monroe and the Monroe Doctrine and President Theodore Roosevelt and his Roosevelt corollary, the United States has always had interventionist purposes as part of its foreign agenda.
Nobody has granted the US the right or role to be the "big brother" who was looking after the interests of the western hemisphere. That is why the US has had many problems throughout history in the Middle East, Latin America, Europe, and other regions.