Suppose you find that houseflies from northern areas are more likely to engage in a food seeking behavior than those from the south.What is the best method to show that these geographic differences are genetic and not just environmental in nature?

A) Sequence DNA from the samples.If the samples differ in DNA sequence by more than a certain amount,then the behavioral differences are genetic.
B) Sequence DNA from the samples.If the samples differ in DNA by more than a certain amount,then the behavioral differences are environmental.
C) Measure other behavioral traits in the samples.If other behaviors also show differences,then the behavioral differences are environmental.
D) Raise the flies in a common environment.If the behavioral differences persist,then they are genetic.
E) Raise the flies in a common environment.If the behavioral differences persist,then they are environmental.