Of the following reactions, which is a fission reaction?
a. hydrogen-2 and hydrogen-3 combining to form a helium-4 atom and a neutron
b. carbon-12 and hydrogen-1 combining to form a nitrogen-13 atom
c. uranium-235 absorbing a neutron and splitting into barium-141, krypton-92, and three neutrons
d. a glucose molecule being metabolized with oxygen into carbon dioxide and water