Answer:
C. Improved transportation has led to infected people quickly spreading diseases around the world.
Step-by-step explanation:
With forty million people infected with HIV and three million new cases each year, AIDS has become the harbinger of a new type of viral infection that symbolically characterizes globalization and social changes. How is it possible that, in less than thirty years, the virus has infected seventy million people around the world, if the starting point is a single person and a single virus? This happened because of the great global communication that has been developing since the mid-twentieth century and along with it the great movement of people.