The correct answer is B. Shi'ites
They believed that Muhammad's cousin and son-in-law, Ali. Opposite to this, Sunnis believed that his Caliph should lead the country.
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.
B! it’s the only answer that would make sense with the sentence
