In an atomic bomb, the energy is released due to

(a) Chain reaction of neutrons and ${}_{92}{}^{235}\mathrm{U}$
(b) Chain reaction of neutrons and ${}_{92}{}^{288}\mathrm{U}$
(c) Chain reaction of neutrons and ${}_{92}{}^{240}\mathrm{P}$
(d) Chain reaction of neutrons and ${}_{92}{}^{286}\mathrm{U}$