A student walked 110 m to the East to look for his class teacher, and then he turned right and walked 40 m. Then he turned right again, and after walking 50 m he reached his class teacher's staffroom. His class teacher was not there. From there he walked 120 m to his north and met his class teacher. How far from the starting point did he meet his class teacher?

• A. 80 m
• B. 100 m
• C. 260 m
• D. 120 m