Layer C is the oldest based on the principle of superposition.
The oldest layer of sedimentary rock based on the principle of superposition is Layer C. The principle of superposition states that in an undisturbed sequence of rock layers, the bottom layer is the oldest, and the layers above are successively younger. Therefore, in this context, Layer C would be the oldest, followed by Layer B, Layer A, and then Layer D.
https://brainly.com/question/34169770