Rathke, Inc. has a defined-benefit pension plan covering its 50 employees. Rathke agrees to amend its pension benefits. As a result, the projected benefit obligation increased by $2,400,000. Rathke determined that all its employees are expected to receive benefits under the plan over the next 5 years. In addition, 20% are expected to retire or quit each year. Assuming that Rathke uses the years-of-service method of amortization for prior service cost, the amount reported as amortization of prior service cost in year one after the amendment is

a. $480,000.

b. $800,000.

c. $240,000.

d. $640,000.