Lincoln Company recorded $40,000 of depreciation as of December 31,2013 on assets acquired that were purchase on January 1, 2013. The assets cost $200,000 and had an estimated useful life of 10 years. The method Lincoln used for depreciating the assets was: O A. the straight-line method O B. an improper method O C. a method permitted only for tax purposes O D. an accelerated method