The correct answer to this question is this one: "B. beginning of spy-plane flights over Cuba."
Sputnik came as a surprising shock to the the US. But it also spurred a larger interest in science and math. It would also kick the US space program into high gear and lay the foundations for the formation of NASA.
Spy flights over Cuba didn't happen until after the revolution in which Batista was overthrown by Castro and a Communist government established, in 1959. Sputnik was launched in 1957 and had no direct connection.