A company purchases equipment for $ 10,000 and originallyestimates useful life of 4 years and a residual value of $1,000 tobe depreciated using straight-line method. After 2 full years, thecompany revises the useful life to 6 years with $0 residual value.Depreciation expense for the remaining would be :

A) $667

B) $1375

C) $1250

D) $875