Read the excerpt from John F. Kennedy's first inaugural address. Then, answer the question that follows. "Finally, to those nations who would make themselves our adversary, we offer not a pledge but a request: that both sides begin anew the quest for peace, before the dark powers of destruction unleashed by science engulf all humanity in planned or accidental self-destruction..."

Kennedy, John F. "Inaugural Address." Washington, D. C., January 20, 1961. Presidential Address.

Which of the choices below is an example of President Kennedy's use of historical background in his speech?
dark powers of destruction unleashed by science
we offer not a pledge but a request
nations who would make themselves our adversary
begin anew the quest for peace