The Social Security Retirement System

The Social Security retirement system:

A) is a fully funded pension system.
B) is a tax-financed system that pays benefits from taxes that are invested to return principal and interest to workers when they retire.
C) is a tax-financed retirement system that finances pensions by taxing workers each year and transferring the bulk of revenues obtained directly to retirees.
D) does not use taxes on workers to pay pensions to retirees.