Final answer:
Helen Keller considered learning to spell water and realizing that every object had a name as one of the happiest moments of her life.
Step-by-step explanation:
The excerpt in the Unit mentions that Helen Keller considered learning to spell water and realizing that every object had a name as one of the happiest moments of her life. This breakthrough happened when Anne Sullivan taught her the word water by spelling it into her hand while running water over the other hand.
Learn more about Helen Keller's happiest moment in life