GMC Inc. owns a building with an original cost of $400,000 and no residual value. If its carrying amount (net book value) is $280,000 at December 31, 2021, it would indicate that:

A. the building has a sales price of $280,000.

B. the building has approximately 30% of its useful life remaining.

C. the building has approximately 70% of its useful life remaining.

D. the depreciation expense is $40,000 per year.

***please explain your answer