What was the "solar neutrino puzzle"?
A. Neutrinos from the Sun were spontaneously changing into unexpected types.
B. Neutrinos fired at the Sun's core were not reflecting properly back to Earth.
C. Particle accelerators on Earth were interfering with the Sun's core.
D. The sun did not produce any neutrinos, indicating it cannot be powered by fusion.
E. The Sun's core was producing too many neutrinos.
Answer: A
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