An Unusual Feature of the 1918 Spanish Influenza Pandemic Is

An unusual feature of the 1918 Spanish influenza pandemic is that

A) victims had unusually poor immune responses to the virus.
B) most fatalities were among young adults, and victims had unusually poor immune responses to the virus.
C) most fatalities were among young adults, rather than infants or the elderly.
D) it originated in Europe, most fatalities were among young adults, and victims had unusually poor immune responses.
E) it originated in Europe, rather than Asia as most influenza strains do.