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Which of the following facts definitely casts doubt on Lamarckian theory:

[A].	Snakes lost their limbs due to burrowing mode of life	[B].	Neck and fore limbs of African giraffe use for generations
[C].	Vestigial organs were functional ones but now undergone degeneration due to loss of their function	[D].	Blacksmith's son does not have powerful arm muscles as his father

Answer: Option D