The Recent Ebola Outbreak Illustrated Global Health Issues in What

The recent Ebola outbreak illustrated global health issues in what way?

A) Low-income countries with low population density were less likely to be affected
B) Once someone contracted the disease, they were likely to die regardless of where they were treated
C) Those treated in the Global North recovered at much higher rates than those in the Global South
D) Diseases like Ebola, which spreads through casual contact, can quickly be spread around the world in the current global age