What is the author's primary purpose in this text?

What is the author's primary purpose in this text?

to inform the reader about various adaptive and maladaptive coping mechanisms

to advise the reader on how to deal with specific stressful situations

to provide a history of psychology and its everyday benefits

to explain how stress can harm someone mentally, emotionally, and physically

The author's primary purpose in this text is to explain how stress can harm someone mentally, emotionally, and physically.