Question: At an archaeological dig site, scientists, volunteers, and students collect items used by people living hundreds of years ago. To determine the history of the different people who may have lived at the site, which is the best method to classify the recovered items?

  Options: 
 A. by the type of item
 B. by the size of the item
 C. by the person who located the item
 D. by the soil layer where the item was found
Answer: D