单选题 Following the preparation of the profit and loss account, it is discovered that work-in-progress has been overvalued by ＄2,000 and an accrued expense of ＄500 has been overvalued. This will have resulted in ______. (a)an overstatement of net profit of ＄2,500. (b)an understatement of net profit of ＄2,500. (c)an overstatement of net profit of ＄1,500. (d)an understatement of net profit of ＄1,500.