Why Do Many Oceanic Volcanoes Occur as Long Lines of Volcanoes

Multiple Choice

Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end?

A) The lithosphere moves over a stable hotspot in the mantle.
B) The mantle convection cell under the crust carries the magma source from one end of the line of volcanoes to the other.
C) The mantle plume that feeds the volcano rotates around the Earth's core, tracing new volcanoes as it does.
D) The spreading lithosphere pushes the underlying magma source across the ocean floor.
E) The active volcanoes are gradually moving away from the oceanic ridge.