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B
Neil's Bohr
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C
Einstein
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D
Henry Becquerel
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Solution
The correct option is D Henry Becquerel
Radioactivity is discovered by Henry Bequerel.
Radioactivity was discovered because of discovery of X rays through fluoroscent.
Henry surrounded photographic plates with black paper and florescent salts with the intention of further advancing the study of X-rays, Henry intended to place the concealed photographic paper in the sunlight.