In a nuclear reactor, the control rods are: a. made of graphite b. used to keep the reactor cool c. used to absorb free neutrons d. all of the above e. none of the above

I think its E. the control rods are used to control the fission rate of uranium and plutonium. Hope this helps!! 

Hi!

The answer is E) none of the above, because control rods in a nuclear reactor is made of uranium

Hope this helped! Have a nice day!

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