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B
Deuterium and tritium only
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C
Protium and deuterum only
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D
Protium, deuterium and tritium
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Solution
The correct option is C Protium, deuterium and tritium Hydrogen has three naturally occurring isotopes: 1H (protium), 2H (deuterium), and 3H (tritium). These isotopes form naturally in nature. Protium and deuterium are stable. Tritium is radioactive and has a half-life of about 12 years.