Which Statement Below Best Describes How to Account for the Costs

Which statement below best describes how to account for the costs of purchasing inventory?

A) The costs are initially recorded as expenses and depreciated over the estimated useful life.
B) Inventory costs are initially reported as assets and then maintained in the asset accounts for the life of the business.
C) The costs are initially recorded as assets and become expenses when the inventory has an increase in market value.
D) The costs are initially recorded as assets and become expenses when the inventory is sold.