The prophecy of the '70 weeks' in Daniel refers to a specific period of time determined for what purpose?

A Rebuilding the Temple in Jerusalem after the Babylonian exile B The ministry of John the Baptist C Finishing the transgression, making an end of sins, making atonement for iniquity, bringing in everlasting righteousness, sealing up vision and prophecy, and to anoint the most holy place D The reign of King Herod