Soil is the uppermost layer of surface of Earth. It has four layers namely, O horizon, A horizon, B horizon and C horizon. The litter can be present in A horizon, i.e., option A.
A layer that is parallel to the soil surface whose physical, chemical and biological characteristics differ from the layers present above and below is soil horizon.
There are 4 soil horizons, namely:
O and A horizon can have some litter.
Thus, the correct option is A.
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