Final answer:
Convection currents moving two tectonic plates away from each other create rift valleys.
Step-by-step explanation:
The correct answer is B) Rift valleys.
Convection currents moving two tectonic plates away from each other create rift valleys. Rift valleys are long, narrow depressions formed by the stretching and thinning of the Earth's crust. These valleys are often found along divergent plate boundaries, where two plates move away from each other.
For example, the East African Rift Valley is a famous rift valley formed by the separation of the African plate into two separate continental masses.