Answer:
A. It affects many.
D. democracy
Step-by-step explanation:
The word "epidemic" has the Greek root "dem", which, as you saw in the question above, means "people". This root gives the word the concept of "many people", for this reason, an epidemic is an infection that is affecting many people at the same time and in the same place.
The same root "dem", can be found in the word "democracy", that the word that indicates a region where the government is established according to the will and sovereignty of the people, that is, once again the concept of "many people "can be established.