Belief systems can be organized into three basic types
a. animism, polytheism, totemism.
c. animism, theism, ethicalism.
b. shamanism, polytheism, monotheism.
d. monotheism, polytheism, ethicalism.
The correct answer is D, because belief systems can either be monotheistic (belief in one God), polytheistic (where multiple gods exist), and then there is also ethicalism, ethical beliefs and behavior generally.
