Answer:
D. A credit to Other Financing Sources for $5,000.
Explanation:
As the equipment is used for governmental service and sold, the journal entry to record the disposal is as follows:
Debit   Cash                         $15,000
Debit   Accumulated Depreciation       $30,000
Credit         Equipment                    $40,000
Credit         Gain on sale of equipment       $5,000
Calculation: Book value of equipment = Cost price - Accumulated depreciation = $40,000 - $30,000 = $10,000
Therefore, Gain on sale of equipment = Disposal value - Book value = $15,000 - $10,000 = $5,000.
Therefore, option A is correct. Option B is also correct. Option C is also correct. Therefore, option D is not correct and it is the answer as it will not include in the journal.