Jordan Inc., a manufacturer of basketballs, has a factory machine they use in the manufacturing process that originally cost $110,000. The machine has a balance in accumulated depreciation of $70,000, so its book value is $40,000. It has a remaining useful life of four years. The company is considering replacing this machine with a new machine. A new machine is available that costs $120,000. It is expected to have no salvage value and last four years. The book value of the old machine:

A) is an opportunity cost

B) is a sunk cost

C) should be considered in the incremental analysis of whether or not to purchase a new machine.

D) is a relevant cost