Which natural resource became more available to the american public as a result of railroad expansion
a) natural gas
b)wood
c)coal
d) water

i'm positive it isn't "b" or "d"
i feel like it's "c" but i have no idea

I believe the answer is: c. Coal

As a result of rail road expansion, we discovered that coal can be used as one of the most cost efficient source of energy at that time. Combined with us not knowing the environmental effect that created after using coal, it became one of the major industries in united states during that period of time.

straight down to hell mate

geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to