Which of the following is true about the first nuclear test bomb? a. There was one nuclear explosion and no dynamite explosion, since the first test bomb did not use a dynamite trigger. b. There was one dynamite explosion and no nuclear explosion, since the first test bomb did not use nuclear fission. c. There were two explosions, the first with conventional dynamite, followed by a nuclear explosion. d. There were two explosions, both created by conventional dynamite.