The Population of a Cactus Species in a Particular Area

Multiple Choice

The population of a cactus species in a particular area has two to seven spines with an average of four spines per square centimeter of surface area.Cacti with fewer than four spines per square centimeter are more easily eaten by the wild boars thriving in the area.Over time,the population of this cactus species in this area have an average of six spines per square centimeter of surface area.This is an example of

A) disruptive selection.
B) directional selection.
C) stabilizing selection.
D) genetic drift.