Answer:
b) point B
Step-by-step explanation:
The point B would have the youngest rocks at the rift zone. The reason for that is that point B is located right on the place where the new crust is formed. That is the place of separation of the tectonic plates. The magma rises from the astenosphere and reaches the surface. As it does, it cools off and creates new rocks, thus new crust, right where the point B is. The continuous pilling up of new crust at the divergent boundary also results in pushing away the older crust, thus we will always have a situation where the youngest rocks are located right where the fault is.