What conclusion can be drawn about the extinction of the dodo?

The dodo was discovered and became extinct in recent history. It often serves as a symbol of extinction. This slow flightless bird was native to the island of Mauritius. Mauritius is located in the Indian Ocean. It was discovered by sailors in 1598. The introduction of humans and new predators upset the balance of the dodo's habitat. The dodo was extinct by 1681.

What conclusions can be drawn about the extinction of the dodo?
A.The dodo was unable to adapt to its quickly changing habitat.   
B.The dodo was not fit to survive in an aquatic environment. 
C.Natural causes led to the dodo's extinction.   
D.Humans hunted the dodo to extinction.