On January 1,2015,Li Company Purchased an Asset That Cost $80,000

On January 1,2015,Li Company purchased an asset that cost $80,000.The asset had an expected useful life of five years and an estimated salvage value of $16,000.Li uses the straight-line method for the recognition of depreciation expense.At the beginning of the fourth year of usage,the company revised its estimated salvage value to $8,000.Based on this information,the amount of depreciation expense to be recognized at the end of 2018 is:

A) $12,800.
B) $16,800.
C) $33,600.
D) $20,800.