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B
Datura
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C
Oenothera lamarckiana
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D
None of the above
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Solution
The correct option is C Oenothera lamarckiana De Vries discovered new forms among a display of the evening primrose (Oenothera lamarckiana) growing wild in an abandoned potato field. Taking seeds from these, he found that they produced many new varieties in his experimental gardens; he introduced the term mutations for these suddenly appearing variations.
So, the correct answer is 'Oenothera lamarckiana'.