Chen Zhengshan has a special classmate, his 63-year-old grandma. His grandma began to look after him 10 years ago. Chen got a bad illness when he was three. His mother left the family. His father couldn't work. So his grandparents began to look after him.  Chen had to take five kinds of medicine every day and it cost the family more than 1,200 yuan every month. Chen couldn't speak well. Some boys often laughed at him at school. He was very sad. In 2008, his grandma decided to go to school with him. She asked the school to let her do so, but the teachers didn't agree. In 2009, she made it,because the teachers were moved by her love. The teachers also asked students to help the boy and collected more than 600 yuan for him. The grandma planned to go to school with her grandson until he got well. She said,"My boy who likes playing the piano is as clever as the other children." ,. Why did Chen's grandma decide to go to school with him?
Because she wanted to learn something. Because her grandson couldn't walk. Because she wanted to look after her grandson. Because her grandson didn't study well.