Which of the Following Statements About Slavery in Ancient Greece

Which of the following statements about slavery in ancient Greece is false?

A) The Greeks believed that in order for some people to act as free individuals others must be slaves.
B) Slavery was determined solely by race.
C) Slaves usually performed the same economic tasks as free citizens, some even held privileged positions such as clerks and policemen.
D) Some slaves, such as those who worked the mines, could be mercilessly exploited.
E) Children sold by their parents or abandoned could become slaves.