Why is kinetic energy removed from neutrons to increase chain reaction chances in a nuclear power station?

Well, if you added extra neutrons, that would help, but where would you get them from ?

A particle accelerator can be used to add neutrons, true, so your answer is not wrong. But that's a new technique, and the expected answer is A.

Using a moderator slows the neutrons, which makes them more likely to be captured.

As I recall, what is going on in fission is not that the neutrons split the next nucleus by sheer kinetic energy, but that slow neutrons are captured, making a new heavier element which is unstable and breaks apart very quickly and releasing extra neutrons.

I'm not sure about the numbers but to produce fission with a U-235 you need low energy neutrons called thermal neutrons which have energies in the order of 0.025eV. This is the reason moderators are used in the reactor, to slow down the fast moving neutron, thus reducing it's kinetic energy. But in the case of a fast breeder reactor, nuclear fission can be carried out with fast neutrons and therefore no moderator is required.

Correct answer is with healthy wealthy people. Once you feel good himself you'r right. It need undertand the wrong answers kill the people. One wrong letter or number lead to emergency.As one rude word on answers in science.