article: I  am a Middle School student.I am a girl. My name is Wang  Ling.Iam 12.I am in No.7 Middle School.  I am in Class2, Grade1.  There are 23 boys and 22 girls in my class.
  Miss Cui is my English teacher. She is a good teacher. We all like her, and we all like English very much .Every morning I practice English with my classmates. I want to write something about Britney Spears on the blackboard.She is from America. She is 23 years old. She is my favourite singer.
question: Wang Ling is  _  years  old.
options: .11 12 13 23