Answer:
C. $ 19.000
Explanation:
The unearned revenue account is a liability account for collections received for which services have not been performed.
The Revenue earned is as follows:
Opening balance (Unearned Revenue) + Additions to Unearned Revenue - Closing Balance (Unearned Revenue)
$ 4,000 + $ 25,000 - $ 10,000 = $ 19,000
so the revenue earned is $ 19,000
This can also be explained by the amounts credited to Unearned Revenue account adjusted for changes in Unearned Revenue balance for the year.
$ 25,000 - $ 6,000 (Increase in Unearned Revenue balance over the period.)