ABC Inc. had service revenue of $70,000 and unearned revenue of $15,000 in its most recent fiscal year. It also had operating expenses of $45,000 and income tax expense of 30% of pre-tax income. In addition, the company paid $10,000 in dividends to its shareholders in the year. What will be the effect of these items on the Retained Earnings account?

• A : $15,000 credit

• B : $18,000 credit

• C : $28,000 credit

• D : $7,500 credit