Answer:
Stabilizing selection
Step-by-step explanation:
Stabilizing selection is one of the types of natural selection. In this process, some members of the particular specie do not survive. The one who survives helps to reproduce.
As per the given question, the pattern of natural selection that is acted to keep the common clutch size is four. In case more eggs are laid, some would be preyed on. The remaining eggs are exposed to better nourishment and a good survival rate.