Question

Examine the following diagram. Place the labeled layers in order from youngest to oldest.

Diagram showing a section of rock strata. The bottommost layer is labeled 'A'; the layer directly on top of layer A is labeled 'B'; the layer directly on top of layer B is labeled 'D'; a narrow section of rock, labeled 'C,' extends from A through B and D and culminates in a volcano.

C, D, B, A
D, A, B, C
C, B, A, D

Answer 1

I think it's the 2nd one, but I'm not sure.

Answer 2

https://www.wikiwand.com/en/Principle_of_original_horizontality

Answer 3

From Oldest Rock to Youngest Rock:
A, B, D, C

C is youngest because it is intrusive.