When did Dr. Evans start to write her book Anger Management?

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Then read the four choices marked A, B, C, and D, and decide which is the best answer according to what you hear.
M: Psychologist Dr. Evans has recently published a book entitled Anger Management. She has come on our show today to highlight the most important points of her new book. Welcome, Dr. Evans.
W: Thank you. I’m happy to be here.
M: How long have you been writing this book?
W: In a sense I’ve been writing it since I became a psychologist twenty years ago. This book is based on all the research I’ve done throughout my career and on my experiences with patients. But I officially began writing it about two years ago, and it just came out in bookstores last month.
M: Now could you tell us about some of the most important points in the book?
W: One very important point I make at the beginning is actually hardly psychological, but rather sociological.
M: Interesting. And what’s that?
W: Anger is not a bad thing. In modern society we view anger as something negative, something we want to avoid. That’s a dangerous misconception. Anger is an emotion and we wouldn’t be human if we didn’t feel it. In fact, many sociologists and community organizers strongly promote that we accept anger in society because it’s a strong sign that something is wrong. They say if we use our anger to drive us to improve society and ourselves, then anger can be a very good thing. However, this is easier said than done.
M: I see.
W: And therefore, what I concentrate on is the type of anger people get and how they express it. In other words, how they manage it.
M: What effect does inappropriate expression of anger have on people?
W: That depends on the person. But one common inappropriate way of dealing with anger is to bottle it up. This is something I blame on modern society. It’s more acceptable for people to always be calm and coolheaded. Therefore, these people who follow this social norm instead of accepting their anger really suffer. This can lead to physical symptoms such as headaches and hypertension. Psychological symptoms of bottling up anger could be persistent violent thoughts or even nightmares.