The first female biologist at the U.S. Bureau of Fisheries, Rachel L. Carson wrote her masterpiece Silent Spring
that showed the American public the dangers of pesticides, especially DDT, resulting[u][/u] in a landmark legislation that made the environment a safer place.
A. that showed the American public the dangers of pesticides, especially DDT, resulting - resu;lting explains the clause next to it which in this case does not make any sense
B. that by showing the pesticides dangers to the American public, especially of DDT, resulted - maybe good
C. and showed the dangers of pesticides, especially of DDT, to the American public, resulting - this separates the book from the "showed the dangers ...'" phrase which is incorrect
D. showing the American public the dangers of pesticides, especially of DDT, resulted - what resulted? Is not linked to the book
E. that showed the dangers of pesticides, especially of DDT, to the American public and resulted - maybe good
Although both B and E make sense and follow the passage idea, E clearly sound better. However it fails to explain the consecutive order of the sentence. The idea is that the showing of the pesticides in the book resulted in the legislation, it was the reason for it. In E, this is not the case, as we have the Book showed .... and resulted .... We do not have this causal relation here.
I suggest B is the right amswer.