Answer:
A. the liability and related revenue are overstated before adjustment
Step-by-step explanation:
An unearned revenue is any amount that a firm gets in advance for services to be provided in future or goods to be delivered in future. So it forms a current liability on the balance sheet .Balance sheet is adjusted when service is provided or goods are supplied in future . The balance of existing liability of unearned revenue is progressively reduced as and when goods are delivered. In this case unearned revenue account is debited and revenue account is credited.