How did the discovery of an effective vaccine by louis pasteur lead to the growth of the europe’s population?

a) vaccines enriched the quality of food being produced, which caused people to live longer and reproduce longer.

b) the use of vaccines caused women to become more fertile and produce more children

c) vaccines reduced the number of diseases in the world, so fewer people suffered illness

d) the use of vaccines europeans live long enough to reproduce more children and reach adulthood