The energy required to initiate an exergonic reaction is calleda) input energyb) hydrolytic energyc) exergonic energyd) endergonic energye) the energy of activation

The answer is the energy of activation.   The energy required to initiate an exergonic reaction is called  the energy of activation.  Energy will react together only after a certain amount of energy is added to them.  Example could be a cigarette lighter.  when you press lighter, the flint will give out a spark to the butane which could ignite into a flame.