Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A company pays its workers on the 1st and the 15th of each month for their service in the previous month. The wages earned from the 15th to the 30th of September by the employees are best described as a(n):
Option A:unearned expense.
Option B:accrued expense.
Option C:prepaid expense.

Answer: B