When discussing a work of art, speaker a talks about how the peice was passed down through four generations of family members, while speaker b mentions the different styles of shading. speaker b is an example of the

Since speaker B talks about the different styles of shading of an art, speaker B user his scientific perspective in describing the said art.  When you say scientific perspective, your describing a real representation of an object.

The answer is ink because it has to soke in the paper so i believe the answer is b.ink 

The answer is a.)