During Normal Climatic Conditions, Regular Amounts of Rainfall, the Average

During normal climatic conditions, regular amounts of rainfall, the average beak depth for finches was 6.8mm. The Grants found that after a drought, finch beaks increased in depth to 9.8mm. The birds with deep beaks 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. What might happen to the population if this trend continues? Choose the graphical representation that would most closely
fit a population that has changed from the majority of individuals having a beak depth of 6.8, to a population where both shallow and deep beaks were the norm and only a few individuals had an average beak depth. What is the name of this type of natural selection?

A)

directional selection.
B)

disruptive (diversifying) selection.
C)

stabilizing selection.
D)
balancing selection.