In sub-saharan africa, aids is very common and continues to spread rapidly. in sub-saharan africa, aids is most accurately described as a(n)

Pandemic    

Explanation:

A pandemic is defined as the epidemic of disease such as AIDS and others which have spread over across large regions and countries. AIDS in the sub Saharan parts of Africa is very common and deadly disease and is considered as pandemic which spreads continuously throughout the region very rapidly.

Hence the answer is -- pandemic

a is the answer because it just is

answer; liaison;