The answer would be choice b, because the prefix 'poly-' means: many :) Please message me or send a comment if you need additional help. Have a very nice day!
A. Monotheism is a belief or worship in ONE god.
C. Animism is just a religion.
D. Atheism is not believing or worshipping a god.
This explains why A, C, & D are wrong answer choices. Hope I helped you a lot.