Answer:
Therefore, the entry to record the sale of the truck involves B. Debit Loss $5,000.
Explanation:
First determine the Accumulated depreciation on the Truck
Depreciation Expense = Cost - Residual Value / Estimated Useful years
                                      = ($140,000 - $20,000) / 6
                                      = $20,000
Accumulated Depreciation :
2018 : $20,000
2019 : $20,000
Total : $40,000
Then Process the Sales journal to determine the profit or loss on sale of Truck as follows :
Accumulated Depreciation $40,000 (debit)
Cash $95,000 (debit)
Profit and Loss $5,000(debit)
Cost : Truck $140,000 (credit) 
Conclusion :
Therefore, the entry to record the sale of the truck involves B. Debit Loss $5,000.