East Asians Who Have Emigrated Recently from India and Pakistan

East Asians who have emigrated recently from India and Pakistan to northern areas of the United Kingdom have a higher incidence of rickets and osteoporosis than the general British population. This phenomenon illustrates that

A) natural selection continues today.
B) genetic adaptation of environmental stressors can occur within one generation.
C) cultural adaptation provides effective shortcuts to those that are genetically disadvantaged in a foreign environment.
D) because of global warming, the lack of sunlight that people are exposed to in the northern regions is made up for by the intensity of the sunlight.
E) natural selection's role in determining skin color is a thing of the past, relevant only prior to the 16th century, when massive population migrations altered the geographic distribution of dark-skinned people.

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