After wwi ended the of 1918 swept through europe making recovery from the war an even greater challenge.
a) polio pandemic
b) influenza pandemic
c) small pox pandemic
d) black plague

The correct answer is the Influenza Pandemic.

This Influenza (flu)  Pandemic killed between 20 and 100 million people (estimates differ)  - more than the war itself!
The source of the Pandemic is still not known, and people suggest such places as the US, China and France.

Mary the first aka bloody mary was catholic