Final answer:
The belief and worship of one god is known as monotheism, which is distinct from polytheism and animism. The correct answer to the student's question is 'a. monotheism'.
The correct option is a.
Step-by-step explanation:
The belief and worship of one god is known monotheism. This is contrasted with polytheism, which is the worship of multiple deities, and with animism, which includes the belief in the divinity of nonhuman beings such as animals, plants, and inanimate objects.
Monotheistic religions include Christianity, Islam, and Judaism, all of which have a significant number of adherents around the world. Each of these religions, though primarily monotheistic, has aspects or sects that could be interpreted differently; for example, the Christian concept of the Trinity or the multifaceted nature of Hinduism's godhead. The correct answer to the student's question is 'a. monotheism'.
The correct option is a.