The correct option is D Soil profile
The collective name for the layers of soil is called soil profile. The soil profile is the vertical section of the soil that is exposed by a soil pit. A soil pit is a hole that is dug from the surface of the soil to the underlying bedrock. Because of the way soils develop, most soil profiles are composed of a series of horizons or layers of soil stacked one on top of the other like layers in a cake. These horizons, identified by letters, A, B, C, D and so on reveal a lot about how the soil formed and what was going on around the soil in the past, much like a timeline.