Current service costaccruedend of year $52,000 Past service costaccrued beginning of year $10,000 Benefits paid evenly throughout the year $85,000 Discount rate used by actuary 6% Actuarial losses in the year $10,000 Pension obligation as at January 1, 20X5 $650,000 Plan assets as at January 1, 20X5 $625,000 What is the balance of the pension obligation as at December 31, 20X5?

a. $671,500

b. $674,050

c. $654,050

d. $673,450