Answer:
it is A
Explanation:
decades are equal to ten years
Sullivan was able to teach Keller successfully by fingerspelling, gesturing, using Braille, and vocal training. Some obstacles that Keller faced learning to sign without seeing her instructor would most likely include having to learn sign through muscle memory and visualization in her head instead of seeing and repeating. Sullivan had to be strict and push Keller to be repetitive in learning the Signs while having to hold Keller's hands to show her how to sign and she could describe signs by fingerspelling.
The black hand was a secret serbian society that used terrorist methods to promote the liberation of Serbs outside Serbia from Habsburg or Ottoman rule and was instrumental in planning the assassination of the Austrian archduke Franz Ferdinand, <span>precipitating the outbreak of </span>World War 1.
So based on that I believe the answer is, A.
