How Are Social Security Tax Revenues Allocated Today

How are Social Security tax revenues allocated today?

A) They are used to pay today's Social Security beneficiaries,and any extra is placed into the Social Security Trust Fund
B) All of today's revenues are placed in the Social Security Trust fund to pay for tomorrow's beneficiaries
C) Tax revenues are placed into accounts for each worker who will draw upon the balance when they retire
D) The revenues are invested in government securities and in the stock market
E) No one really knows