A, B, and C are true so that would leave D as your answer.
Answer:
Which layer of the earth are the same age
Explanation:
RELATIVE AGE. The Law of Superposition states that in a layered, depositional sequence (such as a series of sedimentary beds or lava flows), the material on which any layer is deposited is older than the layer itself. Thus, the layers are successively younger, going from bottom to top.