what the correct answer?

When originally purchased a vehicle costing $23,000 had an estimated useful life of 8 years and an estimated salvage value of $3.000. After 4 years of straight-line depreciation, the asset's total estimated useful life was revised from 8 years to 6 years and there was no change in the estimated salvage value. The depreciation expense in year 5 equals: a $1.600. O b $5.50. O $2.875, d $5,000