fission and fusion?

Question

in nuclear fission:
(a) certain atoms break into fragments when struck be neutrons
(b) a chain reaction does not occur
(c) energy is released mostly as light
(d) all of these

in nuclear fision:
(a) large atoms break apart into smaller atoms
(b) nuclei of atoms combine
(c) liquids are converted to solids
(d) elements combine to form compounds

Answer 1

in nuclear fission:
(a) certain atoms break into fragments when struck be neutrons

in nuclear "fision?" FUSION:
(b) nuclei of atoms combine