Answer:
d. Been denominated in U.S. dollars.
Step-by-step explanation:
If Mild's 20X4 operating income included no foreign exchange transaction gain or loss, then the transaction could have been denominated in U.S dollars.
Furthermore, if it was denominated in U.S. dollars, there is no foreign exchange gain or loss for Mild.
Hence, there would be a gain or loss for Grund.