If the Atlantic Ocean Floor Is Getting Wider,why Is the Earth

Multiple Choice

If the Atlantic Ocean floor is getting wider,why is the Earth not becoming larger?

A) Actually, the Atlantic Ocean floor is not getting wider.
B) Old ocean floor sinks at subduction zones (trenches) .
C) It is becoming denser, so it takes up no more space.
D) It becomes part of the edge of the adjacent continent.
E) It melts at oceanic transform faults.