For the period from the eighth century through the eleventh

For the period from the eighth century through the eleventh century, the shifting boundaries between Kingdom F and Kingdom G have not been well charted. Although a certain village in a border region between the two kingdoms usually belonged to Kingdom G, ninth-century artifacts found in the village were in the typical Kingdom F style of that time. It is unclear whether the village was actually a part of Kingdom F in the ninth century or whether it was a part of Kingdom G but had merely adopted Kingdom F's artistic styles under Kingdom F's cultural influence.

Which of the following would, if found in ninth-century sites in the village, best help in determining whether the village was a part of Kingdom F or Kingdom G in the ninth century?

A. A trading contract written in the Kingdom G dialect
B. A drawing of a dwelling complex known to have existed on the border of Kingdom F and Kingdom G in the ninth century
C. Knives and other utensils made from metal typical of ninth-century mining sites in Kingdom F
D. Some fragments of pottery made in the Kingdom G style from the seventh century out of materials only found in Kingdom F
E. Numerous teeth from the ninth century with a chemical signature typical only of teeth from people who had grown up in the heart of Kingdom F

E[spoiler]

Source: Official Guide 2020[/spoiler]