Answer:
b. Both expenses & liabilities will be understated.
Explanation:
Accrual System of Accounting states that transactions should be recorded when they are entered into, irrespective of their cash settlement occurred r not.
Under Accrual Accounting System : Expense incurred but not yet paid , is an Outstanding Expense. It is recorded as an expense & a liability to be paid.
Journal Entry : Expense Dr to Expense Outstanding Cr
So, Not recording this 'Outstanding Expense' entry : leads to understatement of both expense & liability of that accounting period.