Mercer, Inc., maintains a defined benefit pension plan for its employees. As of December 31, the fair value of the plan assets is less than the accumulated benefit obligation and less than the projected benefit obligation. The PBO exceeds the ABO. In its balance sheet as of December 31, Mercer should report a liability for pension benefits in the amount of theA.

Excess of the ABO over the fair value of the plan assets.

B.

Excess of the PBO over the fair value of the plan assets.

C.

ABO.

D.

PBO.