Depletion is the process of allocating the cost of natural resources to the period when it is consumed.
Depletion can be regarded the lowering down in the level of quantity of a thing or an element, generally due to consumption, in such a way that a few costs are incurred upon such lowered quantity-levels.
In simple words, depletion can be regarded as the incurring of costs upon the reduction of a quantity of something. In the above case, the quantity of natural resources is reduced, causing depletion.
Hence, option A holds true regarding depletion.
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