On January 1, 2009, Woodstock, Inc. purchased a machine with a cash price of $40,000. Woodstock, Inc., also paid $1,000 for transportation and installation. The expected useful life of the machine is 6 years and the residual value is $5,000. Assuming straight-line depreciation, the annual depreciation expense would be:
A. $6,100
B. $6,000
C. $5,950
D. $5,750
E. None of the above