Eurystheus made Heracles perform the 12 Labors primarily because Hera did not like Heracles. Hera, the goddess of marriage and the wife of Zeus, held a grudge against Heracles because he was the son of her husband Zeus and a mortal woman, Alcmene. To punish and humiliate Heracles, she influenced Eurystheus, Heracles' cousin, to assign him these difficult and dangerous tasks. Thus, the correct answer is:
because Hera did not like Heracles.