Which One of the Following Statements About Fission and Fusion

Which one of the following statements about fission and fusion is false

A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes.
B) For a fission reaction the mass defect (Dm) is negative, whereas for fusion Dm is positive.
C) In order for fusion reactions to occur, temperatures must be in the millions of degrees.
D) The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements.
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees.