what is the most widely used source of retirement income?\na. pensions\nb. social security\nc. employer…

Brief Explanations:

Social Security is a government - run program in many countries and is accessible to a large number of retirees. It provides a basic level of income security and is more widespread compared to pensions (which may not be available to all employees), employer - sponsored 401(k) plans (which depend on employer offerings), and individual retirement accounts (which require personal initiative and financial knowledge to set up and contribute to).

Answer:

B. Social Security