A particular population of bird exhibits variation in beak size. Several years ago, a change occurred in the environment where the bird population lives. The graph below shows how the distribution of beak size changed within the population from the point when the change occurred to the present. Which of the following best describes the change that occurred? A. The change caused individuals with larger beaks to be more likely to survive and reproduce. B. The change caused individuals with larger beaks to be less likely to survive and reproduce. C. The change caused individuals within the population to grow larger beaks. D. The change caused individuals within the population to grow smaller beaks.