Discussion
Reflectors of a nuclear reactor are made up of:
Answer: D
The reflector of a nuclear reactor is made of beryllium (graphite is also used). A reflector surrounds the core and sends back the neutrons that would escape, so that fewer neutrons are lost.
Boron is used to absorb neutrons in control rods, so it would remove neutrons and not reflect them. Cast iron and steel are structural materials and absorb neutrons. So the fourth option is the answer.
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