D. Younger workers feared that they would not have sufficient income after they retired.
The other answers aren't accurate. Nothing was stopping anyone from investing their personal funds in the stock market. Birthrates in 2005 (when Bush offered his proposal) were at 14 births for every 1,000 members of the US population. In 1935, when Social Security was first enacted, the birth rate in the US was 18.7 births for every 1,000 members of the population. And 1935 was a low year due to the Great Depression. Birth rates in the 1920s and then again in the 1950s were at 20+ per 1,000 members of the population. Indeed, it's the DECLINE in birth rates that played a role in weakening the funding of the government's Social Security system. More older persons were reaching retirement age, seeking to draw Social Security benefits, and there were less younger workers now paying into the system. Those younger workers feared that before they'd reach retirement age themselves, the Social Security system would become bankrupt.
