When one closes off an area to stop people or goods from entering or leaving a place this means that an embargo on goods is present. This is usually done when one doesn't want a nation to continue its economic relationship with other nations. When people are stopped from entering or leaving a place, this would mean that they are put under quarantine.
Answer:A is the answer
Explanation:The point of the doctrine was to separate the influence in which the United States and European powers would have .Europe and United states will have no intervention within the Western Hemisphere
