Question

an invisible force to which the azande address questions, and whose responses they believe to be truthful is called a(n)
witch.
magician.
oracle.
chief.

Explanation:

Among the options, an oracle is an entity (often considered a supernatural or invisible force in some cultures) to which people address questions and believe its responses. Witches are associated with magic and sometimes malevolent acts. Magicians are more about performing tricks. Chiefs are leaders. The Azande's concept here aligns with the idea of an oracle.

Answer:

oracle.