How was radioactivity discovered?
A) Rutherford was investigating the structure of Au atoms and discovered alpha particles.
B) Marie Curie was investigating the existence of uranic rays that occurred in some minerals.
C) Becquerel was studying X-rays and phosphorescence to see if they were related.
D) Benjamin Franklin was studying the creation of electrical current from the ionization of gases due to radioactive particles.
E) none of the above
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