If there were more seafloor spreading occurring at mid-ocean ridges than subduction at ocean trenches, what would happen to the seafloor in the ocean?

A. Nothing would happen. The ocean's seafloor would stay the same.
B. The ocean's seafloor would sink into the mantle below.
C. The ocean's seafloor would get smaller, losing more crust than its created.
D. The ocean's seafloor would grow, creating more crust than is destroyed.