Brakers are to a car as control rods are to a nuclear-fission chain reaction. The correct option is D.
What is a nuclear-fission chain?
A chain reaction occurs when neutrons generated during fission cause subsequent fission in at least one more nucleus.
This nucleus creates neutrons, and the cycle continues.
The process can be either controlled (nuclear power) or uncontrolled (nuclear weapons) (nuclear weapons).
Thus, the correct option is D. control rods are.
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