please help with accounting...thank you

Which of the following items should be included in the pension expense computation for a defined-benefit plan? Select one: a. Both expected return of plan assets and amortization of prior service cost b. Expected return of plan assets, but not amortization of prior service cost c. Amortization of prior service cost, but not expected return of plan assets d. Neither expected return of plan assets nor amortization of prior service cost A pension liability or asset is required if the fair value of plan assets differs from: Select one: a. the vested benefit obligation. b. the projected benefit obligation. c. benefits paid to retirees each year. d. The accumulated benefit obligation e. The accumulated pension expense