Why does the pattern that you observe across the whole seafloor occur?

A.
The production of new crust at the boundary is random so the pattern is random.
B.
The production of new crust is the same on each side of the boundary so the pattern is a mirror image.
C.
The destruction of the old crust at the boundary is random, so the pattern is random.
D.
The destruction of the old crust at the boundary is the same on each side of the boundary so the pattern is a mirror image.

D. The destruction of the old crust at the boundary is the same on each side of the boundary so the pattern is a mirror image.

D. The destruction of the old crust at the boundary is the same on each side of the boundary, so the pattern is a mirror image.