Which best describes why american indian groups were vnlnerable to European diseases ?

Newspaper started by john campbell:

What was the main idea behind the daoist religion? a. everyone's life was guided by moral behavior. b. to live peacefully meant to live a life of suffering. c. family should be put above all else. d. all things should follow the flow of nature.

This is the largest and most populous country of the caribbean region. puerto rico dominican republic cuba haiti