Meanwhile the desire to express myself grew. The few signs I used became less and less adequate, and my failures to make myself understood were invariably followed by outbursts of passion. I felt as if invisible hands were holding me, and I made frantic efforts to free myself. I struggled - not that struggling helped matters, but the spirit of resistance was strong within me; I generally broke down in tears and physical exhaustion.

—The Story of My Life,
Helen Keller

Which sentence about Helen Keller’s autobiography is true?

It is not credible because it is the story of Helen Keller’s life, and Keller is the author.
It is credible because Helen Keller is the author, writing about her own life.
It is not credible because there are too many details that cannot be proven.
It is credible because it describes events from Helen Keller’s childhood.