Answer: The correct answer is "c. part of a gain when the exchange has no commercial substance and cash is paid (cash paid/received is less than 25% of the fair value of the exchange).".
Explanation: For a nonmonetary exchange of plant assets, accounting recognition should not be given to part of a gain when the exchange has no commercial substance and cash is paid (cash paid/received is less than 25% of the fair value of the exchange).