According to Your Textbook Authors, What Is "New" and Unique

According to your textbook authors, what is "new" and unique about positive psychology is that it has

A) helped clarify the relative independence of the "good" and the "bad."
B) shown the valuable lessons that can be learned from tragedy.
C) shown the health and happiness benefits of a positive outlook.
D) rejected psychology's emphasis on the negative and replaced it with an emphasis on the positive.