One Component of Net Pension Expense,unrecognized Gains and Losses,comes from the Following

Multiple Choice

One component of net pension expense,unrecognized gains and losses,comes from the following sources:

A) the difference between expected and actual prior service cost.
B) the difference between expected and actual return on plan assets only.
C) PBO changes due to changes in pension assumptions only.
D) PBO changes due to changes in pension assumptions,and the difference between expected and actual return on plan assets.