I think the answer is class conflict
Answer:
Assuming you mean ocean ridges, it would be D.
Explanation:
A mid-ocean ridge is formed by seafloor spreading. New ocean crust is formed by magma getting pushed up. The plates move away from each other so the crust would have room to form.
I have attached a picture of the process for visual explanation.
Your answer is B.
Mark brainliest if I am correct.