A researcher argues that dogs can recognize human emotions by combining facial and vocal cues, rather than relying on either alone.
Which experimental finding, if true, would most strongly support the researcher's argument?
- A
Most domesticated dogs have lived in close contact with humans for thousands of years.
- B
Some dog breeds were originally bred for working with humans.
- Ccheck_circle
Dogs responded differently to angry and happy human emotions only when both face and voice were available, performing at chance when given only one channel.
- D
Dogs sometimes appear to respond to their owners' moods.
Explanation
A pinpoints the multi-channel requirement specified by the researcher. B, C, and D are general or anecdotal.