Answer: Using the Accrual basis of accounting, the revenues are reported in May 2018.
Explanation:
Accrual accounting is an accounting method in which the revenue or the expenses will be recorded when a transaction occurs and not when the payment for the transaction is received.
The method follows matching principle, that says that the revenues and the expenses must be recognized at the same period. Therefore, using the accrual basis of accounting, we can see that the revenues are reported in May 2018.