Answer: B - Light water
The most commonly used moderator in nuclear plants is Light water.
Moderators are used to slow down the fast-moving neutrons. Light water is the most commonly used moderator in nuclear power plants. They are used in 75% of the nuclear plants, whereas graphite is used in 20% of the nuclear plants, and the rest uses hard water as the moderator.
Examples of moderators are cadmium rods, heavy water, concrete, etc.
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