Although all birds have feathers and all birds have wings, some birds do not fly. For example, penguins and ostriches...

Ashley-Tien on June 29, 2018

I feel like this problem would benefit from a video; could someone diagram the stimulus and answer choice B?

Anita on June 30, 2018

@hallerae @Ashley-Tien What we can distill the prompt down to is that of a certain category of things, despite their uniform properties, they may be used for different reasons. We see that in the prompt with bird wings: All birds have feathers and wings, but they may use them for different reasons.

In answer choice B, we see something similar: That all chairs have a seat and support like legs, but not all chairs are used for sitting.

Does that help?