Why Is the Retirement of the Baby-Boom Generation Considered a Problem

Why is the retirement of the baby-boom generation considered a problem for the future of Social Security?

A) More retirees mean more people on Medicare, which shares a funding pool with Social Security.
B) Retirees tend to cluster in certain states, which means that the states they are moving from will lose the benefits of their Social Security payments.
C) Social Security functions best when there are fewer workers and more retirees, thus increasing support for the program.
D) Retiring baby boomers will reduce the number of workers per retiree and strain the financial resources of the program.