The Panda's Elongated Wrist Bone or "Thumb" Would Be Explained

The panda's elongated wrist bone or "thumb" would be explained by Darwin's theory in which of the following ways?

A) Some pandas acquired "thumbs" through strenuous activity and then produced offspring with the same characteristic.
B) Some pandas had "thumbs" of different lengths, and in a new environment, those with longer "thumbs" were better able to survive and produce offspring.
C) Some pandas acquired "thumbs" through strenuous activity and were better able to survive.
D) Some pandas had longer "thumbs" and were able to produce offspring.

Correct Answer:

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