If the Earth Is Around 4

Multiple Choice

If the Earth is around 4.6 billion years old, why is the oldest oceanic crust no older than 200 million years?

A) Earth was molten when it formed and took a very long time to cool.
B) Oceanic crust is recycled into Earth's interior at subduction zones.
C) Older oceanic crust was destroyed during the extinction of the dinosaurs.
D) The continents are made of all the old oceanic crust.