What Was the Purpose of Voltaire's Interest in the Execution

What was the purpose of Voltaire's interest in the execution of Jean Calas?

A) Voltaire wished to demonstrate the horror of religious fanaticism and the need for judicial reform.
B) Voltaire was related to Jean Calas and wished to clear his name.
C) Voltaire was hired by the family of Calas to clear his name after he was executed.
D) Voltaire wanted to demonstrate that religious goals would find the truth in the enD.