Question

the 1935 social security act paid retirees a stipend based on
their lifetime investments and bank account savings.
their physical condition at the time of retirement.
the number of children that had been in their families.
the amount they had contributed to the fund.

Explanation:

The 1935 Social Security Act established a system where retirees' stipends were based on their contributions to the Social Security fund during their working years. Lifetime investments/savings, physical condition, or number of children weren't the basis. So the correct option is the one about contribution to the fund.

Answer:

D. the amount they had contributed to the fund.