Answer:
A.
Explanation:
Anne Sullivan was teacher to Helen Keller, a deaf and blind girl from a very tender age. Helen Keller became deaf and blind at a very young age when she was nineteen months old due to severe illness.
At the age of six, Helen Keller was taught how to communicate using 'touch teaching technique.' Teaching Helen Keller was a task for Sullivan yet she was successful in her responsibility. Later, Sullivan lived with Keller till her death and provided her assistance in Keller's schooling, graduation and many other chores.
Therefore, from the given excerpt, one can perceive Sullivan to be successful in her duty to teach and educate Helen Keller. Thus option A is correct.