One major problem in harnessing nuclear energy is- converting nuclear energy into electrical energy.
- sustaining the reaction.
- splitting the nuclei.
- disposing off spent fuel easily.
(d) disposing off spent fuel easily.
Explanation
In harnessing nuclear energy, one major problem is disposing off spent fuel easily, because the waste products of nuclear fission reactions are radioactive, and they keep on emitting harmful radiation for thousands of years.
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