When humanism spread and affected literature authors and dramatists began writing about
a. sinful practices
b. various gods and goddesses
c. biblical tenets
d. human psychology

When humanism spread and affected literature, authors and dramatists began writing about D) human psychology.
Humanism was the period of heightened awareness of humans, and their qualities, and not religion and church like in the previous eras. 

Ithink that'd be 4, sorry if i'm wrong.

  the answer would be a