|A) it stops due to malfunctioning||B) it starts emitting dangerous radioactive radiations|
|C) it is shut down to avoid explosion||D) it is ready to produce controlled energy|
Answer: D) it is ready to produce controlled energy
To produce controlled energy i.e energy at a controlled or steady rate, the number of fissions per second must be controlled and maintained at that rate. Excess neutrons should be absorbed by control roads like cadmium.