Question: A species of bird has not been seen since the 1900s and is considered extinct. Which evidence would best disprove the claim that the bird is extinct?

  Options: 
 A. A bird watcher makes a sketch of the bird.
 B. A scientist discovers fossil remains of the bird.
 C. A researcher takes a photograph of the bird.
 D. A park ranger finds a suitable habitat for the bird. 
Answer: C