Review the detail.
roosevelt explains that one of his reasons for quarantining aggressors is that the peace and prosperity americans were enjoying would be threatened.

which piece of evidence best supports this reasoning?

a) to paraphrase a recent author, "perhaps we foresee a time when men, exultant in the technique of homicide, will rage so hotly over the world that every precious thing will be in danger."
b) on my trip across the continent and back i have been shown many evidences of the result of common sense cooperation between municipalities and the federal government.
c) the high aspirations expressed in the briand-kellogg peace pact and the hopes for peace thus raised have of late given way to a haunting fear of calamity.
d) some fifteen years ago the hopes of mankind for a continuing era of international peace were raised to great heights when more than sixty nations solemnly pledged themselves not to resort to arms in furtherance of their national aims and policies.