Why would the government provide money to people who can't pay for medical expenses?
a. to provide for the national defense
b. to create economic growth
c. to promote the general welfare
d. to be sure consumers are not cheated

The government would provide money and medical care to people who can't afford it to generally decrease the incidence of death and illness in the population: this is one of the components of the C.general welfare - this is the correct answer.

General welfare is something that is desired because it makes the life in a place better for everybody.