The first monotheistic religion was Zoroastrianism. It was founded by the Persians around 2000 BCE. Linguistically, the books of Zoroastrianism have much in common with the Vedic texts, however the Vedic religion itself was polytheistic. Judaism and Christianity both emerged later, inspired by Zoroastrianism.
Language, writing, and laws standardized during the rule of Shi Huangdi because it was a show of strength and power of the emperor. The correct answer is B.
