Final answer:
Zeus knowingly chose the deceptive portion of the ox divided by Prometheus at Mecone, which contained bones instead of meat, setting a precedent for sacrificial offerings.
Step-by-step explanation:
At Mecone, Prometheus divides an ox into two portions to trick Zeus. One portion was made to look appealing on the outside but contained the bones, while the other was unappealing, covered with the ox's hide and stomach, but filled with the nutritious meat.
Zeus chose the deceptive, ornate portion, being aware of the deceit but deciding to set a precedent for future sacrifices from humans. This choice meant that humans would keep the meat for themselves and burn the bones and fat for the gods. Zeus's choice can be considered a form of divine consent to Prometheus's trickery, which further aggravated their relationship, leading to subsequent punishment for Prometheus.