Zarathustra Made a Significant Contribution to Western Thought When He

Zarathustra made a significant contribution to Western thought when he proposed which of the following?

A) That God was pure thought, not a physical individual
B) That human behavior was influenced both by the environment and by upbringing
C) That a person's gender had no bearing on his or her intellectual capabilities
D) That individuals determined their own eternal fate through the moral choices they made while on earth