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Answer:
By the end of Koko's life, she could understand 2,000 words and “speak” 1,000. However, she will be remembered for more than just her intellect. Indeed, by communicating her feelings directly, Koko showed humanity that love, compassion, empathy, joy and grief transcend species.
It seems to be C, but there is not much context providing me to explain myself.
The answer is B. I hope this helps.