The law of superposition states that, in horizontal layers of sedimentary rock, each layer is

A.younger than the layer above it and older than the layer below it.
B.neither older nor younger than the other layers.
C.older than the layer above it and younger than the layer below it.
D.always older than any vertical layers.

PLEASE HELP

Think how layers are piled up, one on top of another. Which came first, the lower one or the higher one? Think of piling up magazines as they arrive. Are the oldest ones at the bottom or the top of the pile?
hint: it is not A

A