Which Would Be the Best Way to Obtain Evidence of a Bird's

Multiple Choice

Which would be the best way to obtain evidence of a bird's cognitive abilities?

A) Observe the bird solving problems in the wild.
B) In captivity,have the bird solve problems like those it would face in the wild.
C) In captivity,have the bird attempt to solve novel problems.
D) All of the above would obtain equal evidence toward thinking ability.