Please Select the Best Example of 'Developmental Adjustment

Please select the best example of 'developmental adjustment':

A) a DNA mutation causes an offspring to have no hair
B) a child is raised at a high elevation develops a larger chest and greater lung capacity than his twin who is raised at a lower elevation.
C) summertime tanning as a response to increased UV rays
D) a well-nourished child grows up to be shorter than she could have been
E) a giraffe baby is born with a longer neck because its parents stretched their necks to get higher leaves