Ivan Works for the Russian Diplomatic Delegation in Chicago as a Part

Ivan works for the Russian diplomatic delegation in Chicago as a part of the Russian Federation Consulate. On Friday night, Ivan has too much to drink and is involved in an automobile accident where several people are injured. Ivan provides identification to the Chicago City Police, and demands to be released immediately.

A) Ivan's demand to be released immediately and not charged with any crime is based on:
B) diplomatic immunity.
C) legislative immunity.
D) witness immunity.
E) international law.