The characteristic is shared by both inceptisols and entisols, the soils of flood plains are  b. both are young and only beginning to develop horizons and a soil profile.
The soil horizon is a layer parallel to the soil floor whose bodily, chemical and organic traits vary from the layers above and beneath. Horizons are described in lots of instances with the aid of using apparent bodily features, especially color and texture.
Most soils have 3 foremost horizons (A, B, C) and a few have a natural horizon (O). The horizons are: O (humus or natural): Mostly natural remember which includes decomposing leaves. The O horizon is skinny in a few soils, thick in others, and now no longer gift in any respect in others.
Thus it is clear that the above answers are correct.
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