Use the Information Below as Background for the Following Questions

Use the information below as background for the following questions.
Immunodeficiencies may be genetic in origin. Two examples of these are Bruton's agammaglobulinemia, an X-linked disorder, and DiGeorge syndrome, caused by a deletion from chromosome 22. Bruton's results in underdeveloped B cells, while DiGeorge syndrome results in a missing or seriously underdeveloped thymus.
-Most newly emerging diseases, no matter how severe their effects on a population, human or otherwise, have which of the following in common?

A) greater severity as there are more and more occurrences of the infection
B) major pandemics, spreading the infection far and wide in the population
C) a tendency to die out rather quickly, cease to reproduce, or cause a less severe effect on the host
D) a destruction of the host immune system and eventual cancer
E) no discoverable relationship with other pathogens in the same or related species