During normal climatic conditions with regular rainfall, the average beak depth for a population of finches was 6.8mm. Researchers found that after a drought, average beak depth increased to 8.8mm. Birds with deep beaks (>9mm) were better able to eat large, hard seeds. Small hard seeds were also available after the drought, but could only be eaten by birds with shallow beaks (<7mm). Choose the graphical representation and term that best represents what would happen in the post-drought finch population if both types of seeds continue to be available.
A. 
balancing selection.
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B. 
stabilizing selection.
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C. 
negative frequency-dependent selection.
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D. 
disruptive (diversifying) selection.
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E. 
directional selection.
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Answer: D
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