Answer:
C. taphrogenic
Step-by-step explanation:
The plate divergence can be described as a taphrogenic process. The taphrogenic processes are the processes through which gaps occur in the crust, and the crust is moving away from the gap that has opened up. This is exactly how the divergent boundaries form. The strong convection currents of the mantle manage to crack the crust, and the magma manages to penetrate through it and melt it. As the magma reaches the the surface, it starts to come out, propelling itself upward, and as it cools of it creates new crust. The magma continues to come out, and more and more new crust is pilling up, pushing the old crust away from the divergent plate boundary.