Final answer:
The animal considered sacred by Zoroastrians is the cow (A).
Step-by-step explanation:
The animal considered sacred by Zoroastrians is the cow (A). Zoroastrianism, the state religion of Persia until the Muslim conquest, was a monotheistic religion that worshiped Ahura Mazda as the supreme god. While the bull is also considered sacred in other religions like Hinduism, the cow held a special significance in Zoroastrianism.