What promise did Sisyphus make to Persephone after telling her that his wife, Merope, didn't give him a proper burial?
- To remain in the underworld after saying a final goodbye to his wife.
- He vowed to convince more mortals to make offerings to the underworld gods.
- That he'd return to the Underworld after punishing Merope.
- He promised to build a temple in Persephone’s honor once he returned.