Which agency is responsible for administering the Social Security program?

The Social Security Administration (SSA) is the correct answer because it is the federal agency specifically tasked with overseeing and administering the Social Security program. This includes managing retirement plans, disability benefits, and Supplemental Security Income (SSI). The SSA ensures that eligible individuals receive their benefits and provides services like issuing Social Security numbers.

The other agencies mentioned have different roles: the Department of Health and Human Services focuses on public health and welfare programs; the Department of Labor handles job-related matters and worker rights; and the Internal Revenue Service deals with tax collection and enforcement. While they may intersect with social security in various ways, none are responsible for the direct administration of the Social Security program.