A、He wrote some parts of the book. B、He drew pictures for the book. C、He translated the book. D、He promoted the book. B

Eighteen-year-old Burnie Rollinson has Asperger syndrome, an autism spectrum disorder. People with Asperger’s have difficulty with communication, eye contact and relationships. Burnie’s mother, Anita Rollinson, wanted to write a book to help people better understand the feelings of children with autism. She has now published, You Were Me.
If You Were Me is a children’s book. Burnie’s mother wrote it in her son’s voice. "I just wanted it written in a way so that other children could possibly read it or have someone read it to them." She says she also wanted to send a message to other parents of autistic children. "I just wanted them to feel that they weren’t alone."
This is how the mother and son worked together on their book: Ms. Rollinson would write a sentence or two and read them to Burnie. Then, he would draw a picture to help explain the meaning of her words.
3.  Why did Burnie’s mother write the book If You Were Me?     
4.  What did Burnie do for his mother’s book?