In Order to Maintain a Solvent Pay-As-You-Go Social Security System

In order to maintain a solvent pay-as-you-go Social Security system in the future:

A) the retirement age will have to be gradually increased in accordance with longer expected lives.
B) the government may have to raise the payroll tax rate or the maximum amount of taxable earnings.
C) the government may have to increase benefits to keep up with inflation.
D) benefits will only be paid to retirees with documented financial need after 2040.