What kind of relationship developed between Helen Keller and Anne Sullivan? (A) A strained relationship shown by the way that Keller went to college without Sullivan and by the way they squeeze hands in the picture

(B) A professional relationship shown by the innovative ways Sullivan taught Keller and by the way neither woman smiles in the picture

(C) A parent-child relationship shown by the way Sullivan controlled Keller's activities and by the way Keller leans on her in the picture

(D) A close relationship shown by Sullivan staying with Keller throughout her life and by the way they hold each other's hands in the picture