In the years from 1850 to 1900, the creation of public health and sanitation projects raise the life expectancy in the united states by almost years.

I the years from 1850 to 1900, the life expectancy in united states increased for about 13 - 15 years.

Back then, the public health and sanitation projects did a lot of works in lower-class community's environment

Since you provide no options, you can choose the one that ranged between those numbers

hope this helps

The central idea is that the hiv/aids epidemic is serious.