Which Statement Is False

Which statement is false?

A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes.
B) The mass defect (Δm) for a fission reaction is negative, whereas Δm for fusion 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 isotopes of many different elements.
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees.