2) Darwin Company purchased machinery on January 1, 2018 for $15,000. The machinery is estimated to have a three-year useful life with residual value of $2,400. The machine will be used in the three years 2018, 2019, and 2020 to produce 3,000, 2,000, and 1,000 units respectively. If the company uses the units-of-activity method, what will be the accumulated depreciation for the machinery on December 31, 2019?

A)$4,200

B)$6,300

C)$10,500

D)$12,600