"The Coolest Kid in School"—Here I Come!This phrase concludes the argument with a heading that fits the tone of the other headings better than Conclusion—plus it captures the tone of the last paragraph when the author celebrates his decision to join the reality show’s cast.
B because when describing a noun with adjectives, you can say: that is a green salad. but if the salad is also big I can say: that is a big, green salad.