Many buried shells have been found in the tombs of nobles in Yin Ruins, and there are also words with "shells" in Oracle Bone Inscriptions as shown in the figure. This means () a.

This question examines students' understanding of money. In the Yin and Shang Dynasties, tortoise shells were used for divination, offering sacrifices to cattle, sheep, pigs and other livestock, and even "human sacrifices" used slaves. Item C is the most confusing and disturbing, but it can be seen from Oracle Bone Inscriptions's translation in the picture that these four words are all related to the transaction or circulation of goods, so item D is correct. So choose D for this question.