求解一道英文会计题目~感谢~~Which of the following errors would cause the

求解一道英文会计题目~感谢~~
Which of the following errors would cause the Balance Sheet and Statement of Owner's Equity columns of a work sheet to be out of balance?
A. Entering a revenue amount in the balance sheet and statement of owner's equity debit column.
B.Entering an expense amount in the balance sheet and statement of owner's equity debit column.
C.Entering a liability amount in the income statement credit column.
答案是A，我怎么觉得都是对的.....