Black-bellied seedcrackers have either small beaks (better for eating soft seeds) or large beaks (better for hard seeds). There are no seeds of intermediate hardness; therefore, which kind of selection acts on beak size in seedcrackers?
A. Stabilizing selection
B. Directional selection
C. Disruptive selection

Disruptive Selection.

Explanation:

Disruptive selection is also known as Diversifying selection.Disruptive selection helps in determining the changes which is seen in population genetics, The disruptive selection favours those individuals which have the smallest and largest values of the trait or characteristics.These individuals possess the highest fitness. The individuals which have an intermediate values have lower fitness.The example of Disruptive selection is seen in Male lazuli buntings Feather colour which is also kown as Passerina amoena.Passerina amoena is a bird species which is native to North America.