Read the following sentence from the article that describes the relationship between honeyguides and humans. "It's an exchange of
information for skills," said study lead author Claire Spottiswoode,
anevolutionary biologist at the University of Cambridge. Which of the
following selections from the article BEST explores the above statement?

The honeyguide has a unique ability to find bees' nests. Scientists are not quite sure
O how it works, but it likely has to do with an advanced sense of smell, Spottiswoode
said. Still, there is a problem.

When honeyguides hear the call they also make a noisy response and then fly from
tree to tree, leading the honey hunters to the bees. The humans open up the tree,
smoke out the bees and take the honey. The birds eat the wax, Spottiswoode said.

When biologists compared the "brrr-hm" sound with other sounds, the traditional
sound sent the honeyguides to hidden bees' nests more often, according to a study
just published in the journal Science.

While humans train dogs and other animals to hunt, this is different because those
animals are domesticated and these are wild birds, not trained specifically by humans,
Spottiswoode and other scientists said.