According to the passage, ______as the employees’s own business applies to the management of human resources in American companies

A．They lived in large groups.
B．They used sand as insulation.
C．They kept fires burning constantly.
D．They faced their homes toward the south.

A．A message from the outside world.
B．A symbol of misfortune.
C．A warning from the gods.
D．A gift from the gods.