Which statement describes the function of control rods?

They release neutrons during fission reactions.

They undergo nuclear fission reactions.

They control the rate of reactions.

They directly convert water to steam.

I think the correct answer from the choices listed above is the third option. Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They control the rate of reactions by absorbing neutrons. Hope this answers the question. Have a nice day.