What Are the Four Basic Components of Pension Expense

What are the four basic components of pension expense?

A) Service cost, benefits paid, expected return on plan assets, and amortization of deferred amounts
B) Service cost, benefits paid, actual return on plan assets, and amortization of deferred amounts
C) Service cost, interest cost, actual return on plan assets, and amortization of deferred amounts
D) Service cost, interest cost, expected return on plan assets, and amortization of deferred amounts
E) None of the above