An epidemic is the rapid spread of a disease across
a. the world
b. a region
c. a continent
d. oceans

A region is a part on the earth's exterior that has unifying features such as environment or industry. In a city or town, there may be economic or trade areas along with the domestic regions. A good example is in the United States, we generally recognize the South-land as a region.

An epidemic is an outburst of a disease among segments of a particular population that surpasses the extent of the existence of the disease usually found in that population. Epidemics affect those parts of the population who do not have an obtained or innate resistance to the disease. Although maximum epidemics are produced by dangerous organisms, the name can be employed to an outburst of any lingering infection, such as lung cancer or heart disease.

The correct answer is b. a region

Explanation:

An epidemic occurs when an infectious disease spread rapidly in the population by affecting a huge number of population that live in a region. So in epidemic, a large number of individual gets affected by a disease than normally expected.

One of the example of epidemic disease is influenza, in winters some region of north hemisphere shows a high incidence of influenza virus which then consider as epidemic disease. Some other examples of epidemic diseases are cholera, chikungunya, Ebola, Lassa virus, etc.

So the correct answer is b. a region.

be confident on yourself. ignore such fools and move on ; )