Answer:
A. increases the balance of an expense account
Explanation:
The following effect can be shown through an example -
If we increase the credit portion of an adjusting entry to increase the balance of a liability account, the effect of the debit portion will be an expense.
For example -
When wages expenses incurred but not paid, at that moment, a liability will increase due to that effect. The journal entry to record that transaction is -
Wages expense Debit
Wages payable Credit
Therefore, the adjusting entry increases the liability as well as the expenses.