Which of these is a government program that could provide you with an income when you retire?

The correct answer is A. Social Security.

Social Security is a government program designed to provide financial support to individuals after they retire or become disabled. It offers a monthly income based on your earnings history. On the other hand, 401(k) and Roth IRA are retirement savings accounts that individuals contribute to, and Medicare is a health insurance program for the elderly, but it does not provide direct income.