A Mountaintop Is Made of Limestone Overlying a Layer of Basalt

A mountaintop is made of limestone overlying a layer of basalt. What would be the origin of this mountain?

A) The limestone would have formed by sediment in a river valley where the river was flowing over basalt.
B) The limestone would have formed by volcanic outflow and the basalt would have been part of the volcano.
C) The limestone would have formed at the bottom of an ocean and the basalt would have been part of the oceanic crust.
D) The basalt would have formed under metamorphosis by the pressure of the limestone that formed by sedimentation on top of it.

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