The Concept of Tian or "Heaven" Which Had, by the End

The concept of tian or "Heaven" which had, by the end of the Zhou era, become the guiding force in nearly every major Chinese religious and philosophical tradition:

A) represented a turning point toward a less abstract and a more personalized approach to religion.
B) was of minor importance in the evolution of religious thought in China.
C) represented a turning point toward a more abstract and universal approach to religion.
D) had its origins in the Xia era.