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(B) In a nuclear reactor, the neutrons produced during fission are fast-moving. These fast neutrons are less likely to cause further fission in $U^{23

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Slow down the fast neutrons

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(B) In a nuclear reactor, the neutrons produced during fission are fast-moving. These fast neutrons are less likely to cause further fission in $U^{235}$ nuclei. The moderator (such as heavy water, graphite, or ordinary water) is used to slow down these fast neutrons to thermal energies, making them more effective at sustaining the chain reaction. Control rods are used to absorb excess neutrons to regulate the reaction rate, while coolants are used to remove excess heat.

In a nuclear reactor, the main purpose of the moderator is to

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