So you can know to avoid those microbes
Econmy i believe is the answer which history is this
Corn was harder to transport
Https://quizlet.com/111426380/frenchindian-war-causes-and-effects-flash-cards/
Credits to https://quizlet.com/mcdermottw20
The Theory of Mass Dissemination suggested that fashion moves horizontally among social classes rather than vertically.
So the correct answer is C.
Hope this helps,
Davinia.