Context is vital to answering this question. The Beothuk people are described as the indigenous people, not the Norse people that the researchers were investigating. Since these two kinds of people are very different, the underlined portion of the sentence must be used to contrast the two types of people. Since the closing sentence focuses on iron and metal, while the transition sentence focuses on bone and wood, it can be reasonably implied that the transition should lead into a contrast between the two. Although the “NO CHANGE” option does mention bark, this does not provide any transition into the discussion of metal in the following sentence. Choice B, however, does highlight the fact that the Beothuk people did not use any metal in their tools and structures, so B is the correct answer.