How did the introduction of smallpox contribute to the demise of Aztec society?

Responses
A Smallpox killed many victims outright leaving others to care for the sick.Smallpox killed many victims outright leaving others to care for the sick.
B Smallpox hurt the economy as the Aztecs had to focus all resources on finding a cure.Smallpox hurt the economy as the Aztecs had to focus all resources on finding a cure.
C Smallpox encouraged the Aztecs to back the Spaniards in an effort to get the disease to stop.Smallpox encouraged the Aztecs to back the Spaniards in an effort to get the disease to stop.
D Smallpox divided the Aztecs due to an unwillingness to agree on how to best fight the disease.

A Smallpox killed many victims outright leaving others to care for the sick.