Final answer:
The Feast of the Epiphany commemorates the baptism of Jesus in the Jordan River, which is the correct event marked by this celebration.
Step-by-step explanation:
The Feast of the Epiphany, also known as Theophany in the Eastern Orthodox Church, marks the day when Jesus was baptized in the Jordan River. This event is described in Matthew 3:13-17, Mark 1:9-11, and Luke 3:21-22, and it encompasses John the Baptist baptizing Christ, with a divine voice proclaiming Jesus as God's Son, and the Holy Spirit descending upon him like a dove. Hence, the correct answer is C) Baptized in the Jordan.