All of the following were fears regarding immigrants after wwi except:

a.
immigrants would overrun universities
c.
labor feared unskilled workers
b.
businessmen feared dangerous radicals
d.
immigrants were thought by some to threaten american culture

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.