If the Amount Extracted from a Coal Mine Were Different

If the amount extracted from a coal mine were different every year for four years, you would:

A) recompute the depletion expense rate per unit each year.
B) use the same depletion expense rate per unit each year.
C) debit Depletion Expense for the same amount each year.
D) credit Accumulated Depletion-coal mine for the same amount each year.