Answer: Option D
Step-by-step explanation: In simple words, unearned revenue refers to the liability account that depicts the cash that is received in the current for the supply of good or service that will be made in some future period.
For example- a door to door newspaper seller taking advance subscription fees for one year or any event organizing committee taking advance money for tickets of a concert that will happen in the future.
Such incomes can only be recognized when the intended service is completed for the customer.