Hope this helps! Good luck :)
I would say A but i am not 100% sure.
The Monroe Doctrine<span> was </span>important<span> because it stated that the newly independent United States would not tolerate European powers interfering with the nations in the Western Hemisphere, and if the European powers did interfere, then the United States would retaliate with war.
*Hope this helps</span>
The answer is: A. Original Jurisdiction.