Answer C

Hi, I am not an instructor, but I believe the problem with C is that Kendall only made a point about durability. Robin stated that non-durable items conclusively points to a nomadic society. Kendall pointed out that societies will use materials available: thus, a sedentary society may create non-durable items because they only have access to non-durable materials. Whether or not durability of items can conclusively determine whether a society is nomadic and sedentary is the main point of disagreement. The two never venture into any alternate evidence can sole determine whether a society was sedentary or nomadic, which is what C alludes to.

I would also eliminate C on the ground that neither tell us anything about other kinds of evidence.