The correct answer is A) They provided an effective medical response where the disease originated.
The trend that best explains how nations detailed on the map were able to quickly contain the outbreak of Ebola was "They provided effective medical response where the disease originated."
In the map, we can clearly see the reported Cases of Ebola outside West Africa. Ebola is a major health threat in African countries that has caused many deaths. The map is from January 2015.
The map shows the location of recovered patients that were in Omaha, New York, Atlanta, Oslo, London, Hamburg, Geneva, Madrid, and Rome. In-treatment patients were in Paris. Deceased patients were in Omaha, Dallas, Leipzig, and Madrid.
The first medical response to treat patients was one of the most important actions that helped to contain the spread of the disease. As we observe, most of these places are first-world countries or developing nations that had the resources and modern health services that allow these countries to swiftly react in the case of detected patients with this kind of disease. That is how they were capable of containing the spread of Ebola.