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Nuclear fusion, the Sun's energy source, most commonly fuses hydrogen isotopes into:

ACarbon
BOxygen
CHelium
DLithium
Answer & Solution
Correct answer: C. Helium
1. Lighter nuclei join into a heavier one. 2. Hydrogen fuses into helium. 3. Extreme temperature and pressure are needed. _Source: syllabus Science, Chapter 14, Sources of Energy._
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