Down-the-line trade (Multiple Choice)

Down-the-line trade
 
  a. results in the steady decline in the frequency of artifacts made of a particular material as the distance increases from the source of the raw material.
  b. results in the steady increase in the frequency of artifacts made of a particular material as the distance increases from the source of the raw material.
  c. results in a high density of artifacts at long distances from trading centers.
  d. is when a raw material is procured by people close to its source.
  e. results in culture not produced locally from raw materials found locally.