On January 1, 2015 Sky Company purchased a patent for $94,000. The company originally expected to use the patent for eight years and then sell it for $5,000. During 2021, management adjusted the total useful life of the patent to thirteen years and the residual value to $1,000. The company amortizes all patents using straight-line.

At 1/1/21, the number of years remaining in the revised estimated total life of the patent is A. 8 B. 7 C. 13 D. 6