Final answer:
The East African Rift is being produced by tensional stress, which occurs when rocks are pulled apart and is typical at divergent plate boundaries.
Step-by-step explanation:
The type of stress currently producing the East African Rift is tensional stress. Tensional stress occurs when rocks are being pulled apart from each other.
This is typical of a divergent plate boundary, where the tectonic plates are moving away from each other, creating a rift zone. The East African Rift is an active continental rift zone in East Africa where the African plate is being split into two smaller plates, which is generating tensional forces and causing the crust to stretch and thin.