choose the one sentence from this part that shows that robert yerkes did not get the results he had hoped…

choose the one sentence from this part that shows that robert yerkes did not get the results he had hoped for. yerkes sent a chimp named gua to live in a human household alongside a toddler named donald kellogg. in this \reverse tarzan\ experiment, gua and donald were supposed to grow up together. yerkes hoped gua would learn everything that donald learned, including how to talk. but gua never uttered a word.
Answer
Brief Explanations:
Yerkes hoped Gua would learn to talk like Donald, but the sentence "But Gua never uttered a word" shows this hope was unfulfilled.
Answer:
But Gua never uttered a word.