Which of the Following Statements Is True

Which of the following statements is true?

A) For tax purposes, a business must use the straight-line method of depreciation.
B) For tax purposes, a business must use the diminishing value method of depreciation.
C) For tax purposes, a business may use either the straight line or diminishing value method of depreciation.
D) The depreciation method used for tax purposes must be the same as that used for external reporting.