D. All of these. Informational references are available in all of these.
We can actually deduce here that the reason Hellen Keller's father to write the Perkins institution was because of the condition of Hellen Keller. She was blind.
<h3>Who is Hellen Keller?</h3>
Hellen Keller was actually known to be a young girl was deaf and blind. It was at nineteenth months old that her parents discovered that she was deaf and blind. Bell had to meet with Keller's parents and suggested that they contact the Perkins Institute for the Blind in Boston, Massachusetts.
Her parents then wrote to the Perkins School for the Blind. She later attended the Perkins School for the Blind. It was in this school that Keller learnt how read and how to speak. She made up her mind to learn. Hellen Keller learnt many languages including French, Latin, Greek and German.
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To maintain their credibility,the writers had to give specific examples---evidence--- of how they had been mistreated.
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No because the bill of rights had to the Amendments, and common sense dealt with the declaration of Independence.
