Which of these happened before the scientists discovered that the centuries-old bones did not belong to the yellow-eyed penguin? A Researchers concluded that the Waitaha penguin was once native to New Zealand.

B Researchers determined that the Maori hunted the penguin to extinction by about 1500.

C Researchers said that the Waitaha penguin and the yellow-eyed penguin competed for the same food.

D Researchers went to New Zealand to investigate the human impact on endangered yellow-eyed penguins.​