Final answer:
The book value of an asset is the cost minus accumulated depreciation. Option B.
Step-by-step explanation:
The book value of an asset is defined as the cost minus accumulated depreciation.
Book value represents the net value of an asset on a company's balance sheet. It is calculated by subtracting the accumulated depreciation from the original cost of the asset.
For example, if a company purchased a car for $20,000 and the accumulated depreciation after a year is $5,000, the book value of the car would be $15,000 ($20,000 - $5,000). So Option B is correct.