What Happens to the Excess Revenues During the Years When

What happens to the excess revenues during the years when the Social Security trust fund runs a surplus?

A) The funds are divided among the states to subsidize public works projects.
B) The funds are used to buy securities from the federal government and are then used to contribute to the operating costs of federal agencies.
C) These funds are diverted to finance global humanitarian efforts.
D) They are used to buy stocks to raise additional revenue for the federal government.
E) They are used to pay off the national debt.