The principle of supposition is that each new:.
A. Sedimentary layer is older than the layer above.
B. Sedimentary layer is younger than the layer below.
C. Layer of sediment is laid down nearly horizontally.
D. Layer of sediment is laid down accordingly.

The best answer is "B"

Sedimentary layer is younger than the layer below.

Explanation:

The principle of supposition states that sedimentary layer is younger than the later below it but older than the later above it.

This is because a younger layer cannot slip beneath a layer previously deposited.

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