Final answer:
The incorrect reason for immigrant families all needing jobs is that only those who worked could get good health insurance. Historical reasons were related more to basic economic necessity and survival.
Step-by-step explanation:
The reason most members of immigrant families had to get a job that is not accurate among the provided options is D. Only those who worked could get good health insurance. During the historical period being discussed, the primary reasons for immigrants seeking jobs were economic necessity and survival. Immigrants often had to deal with low wages, inconsistent job security, and the need to pay off debts incurred from their voyage to America. Moreover, employment-based health insurance was not a standard practice as it would be in later years. Most jobs available to immigrants did not pay very much, and multiple family members needed to work in order to sustain the household. Health insurance as an employment benefit was not a significant factor for most working-class immigrants during the time periods that saw large influxes of immigration.