What was the prophecy that Themis gave to Deucalion and Pyrrha?

The prophecy given by Themis to Deucalion and Pyrrha instructed them to repopulate the earth after a great flood sent by Zeus to cleanse humanity. After surviving the flood in a vessel, Deucalion and Pyrrha became the only survivors and were tasked with restoring humanity. Following Themis's guidance, they threw stones over their shoulders, which transformed into human beings and effectively initiated the repopulation of the world. This account highlights the theme of renewal and the continuation of life following destruction.

The other options do not reflect the essence of the prophecy. Building a ship was related to their survival during the flood but was not the central purpose of Themis's guidance. The idea of finding a hidden treasure is unrelated to their narrative, and seeking vengeance against the gods contradicts the themes of humility and obedience that characterize their story. Thus, repopulating the earth is the accurate representation of Themis's message to them.