Which of the Following Is True of Depreciation Cost

Which of the following is true of depreciation cost?

A) Depreciation cost on equipment is irrelevant in decision making because depreciation on equipment that has already been purchased is a past cost.
B) Depreciation cost on equipment is relevant in decision making because depreciation on equipment that has already been purchased is an opportunity cost.
C) Depreciation cost on equipment is irrelevant in decision making because there is no cash transaction.
D) Depreciation cost on equipment is irrelevant in decision making because depreciation on equipment that has already been purchased is an opportunity cost.