13. The following information pertains to Lavana Corporation's defined benefit pension plan: ($ in 000s) 2018 2019 Beginning BalancesBeginning Balances Projected benefit obligation ($6,000) ($6,504) Plan assets 5,760 6,336 Prior service cost-AOCI 600 552 Net loss-AOCI 720 786 At the end of 2018, Lavana contributed $696,000 to the pension fund and benefit payments of $624,000 were made to retirees. The expected rate of return on plan assets was 10%, and the actuary's discount rate is 8%. There were no changes in actuarial estimates and assumptions regarding the PBO. What's the 2018 service cost for Lavana's plan? O A. $648,000 O B. $528,000 O C. $276,000 O D. Can't be determined from the given information