Answer:
B. Are the excess of the cash received over the book value.
Explanation:
Gain on sale of long term asset is the excess value received as against the asset over its current carrying value.
As for example the carrying book value of an asset = $200,000 and its selling price = $250,000
Then, gain on sale of long term asset = $250,000 - $200,000 = $50,000
Which is excess of cash received over book value.