There is neither gain or loss on sale of despreciable asset for an amount exactly equal to its

A.aquisition cost
B.book value
C.oportunity cost
D.histicorl cost

The correct answer is B. book value.

To arrive at this answer, we need to understand what the book value of a depreciable asset represents. The book value is the cost of an asset minus its accumulated depreciation up until the date of the sale. It represents the net value of the asset as recorded on the company's books.

When an asset is sold for an amount exactly equal to its book value, it means that the sale price covers the original cost of the asset and also accounts for the depreciation that has been charged over its useful life. Therefore, there is neither gain nor loss in this scenario.

To calculate the book value, you need to know the original cost of the asset and the depreciation charged on it. The original cost represents the acquisition or historical cost (option D), which is the cost incurred to acquire the asset initially.

Therefore, option B (book value) is the correct answer in this case.