Which ancient society observed monotheism, belief in only one god?

A. Jews

B. Aryans

C. Egyptians

D. Babylonians

Oh easy,

Let's see the basics,

For Jews, they believe in only one god which is ... God

For Aryans, they were originally nature worshipers who revered a number of gods and believed that their gods represented forces of nature.

For Egyptians, well duh they worshiped a lot of gods and goddesses! (Ran, Isis, Horus, and etc.)

For Babylonians, lets see, Tiamat, Enlil, Enki, Mardu, Ishtar, Shamas, etc.

So, the answer is definitely A. Jews

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