Please explain the answer

Plan assets, 1/1/12.. $450,000 Projected benefit obligation, 1/1/12. 450,000 Annual service cost for 2012.. 27,000 Settlement rate for 2012... 7% Actual return on plan assets for 2012 30,000 Contributions (funding) in 2012. 32,000 Benefits paid to retirees in 2012... 17,000 The balance of Plan assets to be reported end of 2012 is O a. 495,000 b. 57,000 O c. 491,500 O d. 62,000