Alex the African grey parrot lived and was studied for 30 years before his death last year . His researchers taught him english and then tested his reasoning abilities . In one test Alex was presented with a tray on which lay a green key and a green cup .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason Alex the African Grey was appreciated in life ?
Options:
A. Researchers were able to learn much about how the mind of an older Macaw works .
B. The knowledge that was gained by working with him is invaluable .
C. Alex was able to teach his researchers much about birds in his 20 years of service .
D. None of the above choices .


B