Which Statement Is Not True

Which statement is not true?

A) In the computation of pension expense, a negative return on plan assets can be added.
B) The amount of prior service cost is not included as an asset or a liability.
C) Interest cost is equal to the projected benefit obligation at the end of the period multiplied by the discount rate used by the company.
D) A lower-than-expected mortality rate creates a pension loss to a company.