Matching principle requires the recognition of expenses in the period in which they incur to generate revenues. Therefore, as of the end of period, all expenses should be recorded independent from whether they are paid or not. When an expense incurs but is not paid yet, it should be recorded as accrued expense. In other words, accruals can be defined as liabilities for unpaid expenses. The most common examples of accrued expenses are interest payable, salaries payable, income taxes payable etc. The correct answer is D.