. . . our kings of zhou treated the people well . . . and presided over services to spirits and to heaven. heaven therefor instructed the zhou kings, chose them . . . and gave them the decree to rule.
-- book of history
based on this quote, why did heaven give the zhou kings the mandate of heaven? Select the two correct answers
A. because they instructed the people
B. because they treated the people well
C. because they sacrificed to the spirits
D because they devoted riches to heaven
E. because they won battles in the name of the spirits
F. because they presided over services to spirits and to heaven
B. because they treated the people well
F. because they presided over services to spirits and to heaven