Final answer:
The present stage of the East African Rift in the supercontinent cycle is the rift stage.
Step-by-step explanation:
The present stage of the East African Rift in the supercontinent cycle is the rift stage. Continental rifting is a process in which a continental mass splits apart and two separate new landmasses form and drift away from each other. The East African Rift is evidence of a split in the African Plate, dividing it into the Somalian Plate and the Nubian Plate. This rift is part of the larger process of plate tectonics, where new crust is formed and old crust is destroyed. The African portion of the rift extends from Mozambique to the Red Sea, and it includes the Great Rift Valley.