Answer: B. the asset's acquisition cost less the total related depreciation recorded to date.
Explanation:
Plant Assets will depreciate over the years or as they are used. For this reason, they need to be recorded at a value that takes this into consideration and this value is the Book Value.
The Book value is the cost of the asset less the total depreciation that the asset has accrued over the years up until that point. If the cost of machinery was $5,000 when it was bought but has depreciated by $3,500, the book value will be $1,500.