What did Boas mean by saying classification is not explanation?

What did Boas mean by saying classification is not explanation?
 
  a. He argued that grouping similar artifacts (across cultures) as like collections does not explain the meaning they had in their own cultural contexts.
  b. He meant that museum curators needed to become anthropologists and go out and collect Native explanations for artifacts they were displaying.
  c. He meant that explanations do not change from one culture to another and that there is no reason to individually describe each cultural artifact.
  d. He argued that history is important and the ways that artifacts have changed over time is more meaningfulthat change over time is more valuable than small differences in similar artifacts.