Final answer:
The depreciation method that mostly correlates with depletion is the units-of-production method. This method is used to calculate depreciation based on the actual usage or production of an asset.
Step-by-step explanation:
The depreciation method that mostly correlates with depletion is the units-of-production method. This method is used to calculate depreciation based on the actual usage or production of an asset. Similarly, depletion is a method used to allocate the cost of natural resources based on the amount extracted or used.
Therefore, the units-of-production method is closely related to depletion as both methods allocate costs based on the usage or extraction of resources.