A researcher claims that ravens can hold grudges, treating people who have previously deceived them differently from people who have treated them fairly.
Which experimental finding, if true, would most strongly support the researcher's claim?
- A
Ravens are members of the corvid family of birds.
- Bcheck_circle
Ravens preferentially exchanged tokens with experimenters who had previously given them fair trades, while avoiding experimenters who had cheated them in earlier sessions.
- C
Ravens can mimic human speech in some cases.
- D
Ravens are found on multiple continents.
Explanation
A directly demonstrates differential treatment based on prior fairness, supporting the grudge claim. B, C, and D are general facts.