B. Climax.
Explanation:
Climax exemplifies the peak or the highest point of the story that are the turning points of the story. This paragraph also illustrates the turning and the most intense point of Helen Keller's life when after a long struggle she faced due to early age impairments, began to feel the motion in her fingers and began to learn the letters(the mystery of language). It is the most significant point of her life as illustrated in her autobiography("The Story of My Life") which gave her an identity despite having so much struggle in her life. Thus, the excerpt displays the climax of the plot.
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Explanation: