| [ A ] Thorium |
|
| [ B ] Radium | |
| [ C ] Ordinary water | |
| [ D ] Graphite | ![]() |
| [ A ] Thorium |
|
| [ B ] Radium | |
| [ C ] Ordinary water | |
| [ D ] Graphite | ![]() |
| Answer : Option D |
| Explanation : |
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