Rachel carsons book silent spring warned that one day few birds would be left to usher in the spring because of

Silent Spring is an environmental science book by Rachel Carson. The book was published on 27 September 1962 and it documented the detrimental effects on the environment of the indiscriminate use of pesticides. Carson accused the chemical industry of spreading disinformation and public officials of accepting industry claims unquestioningly.

In the late 1950s, Carson turned her attention to conservation, especially environmental problems that she believed were caused by synthetic pesticides. The result was Silent Spring (1962), which brought environmental concerns to the American public. Silent Spring was met with fierce opposition by chemical companies, but it spurred a reversal in national pesticide policy, led to a nationwide ban on DDT for agricultural uses, and inspired an environmental movement that led to the creation of the U.S. Environmental Protection Agency. 

answer; /// i believe that the correct answer is (b)///they gained vast amounts of

i think it was   tsar alexander ii