Which of the following is an example of stabilizing selection?

(A) is an example of Disruptive selection, (B) is also disruptive selection and more specifically a bottleneck, (C) is Directional selection, (D) is Stabilizing selection, (E) is yet another type of disruptive selection. I forget the specific names of all the types of disruptive selection at the moment, but it doesn't really matter for this question, the correct answer is (D).