The Element Iron, Having Atomic Number 26, Is the "Crossover

The element iron, having atomic number 26, is the "crossover point" between fusion and fission. Why?

A) Because all elements heavier than iron are radioactive, implying that they will fission easier than they will fuse.
B) Because for elements lighter than iron, fusion converts nuclear energy to non- nuclear energy, whereas for elements heavier than iron, fission converts nuclear energy to non- nuclear energy.
C) Because for elements lighter than iron, fusion converts non- nuclear energy to nuclear energy, whereas for elements heavier than iron, fission converts non- nuclear energy to nuclear energy.
D) Because neutrons will only split the elements that are heavier than iron.
E) Because of the neutron balance that results from splitting a nucleus.