Answer:
The best answer is B, It is an additional resource that provides historical facts.
Explanation:
The report from the Chicago Tribune provides facts/insight into the history of the safety of sports.
"Before modern helmets, in 1904, the Chicago Tribune reported 18 football deaths and 159 serious injuries—in that one year alone." - This statement from “Heads Up on Sports Safety” is factual, so it further supports the claim that the inclusion of the report from the Chicago Tribune is is an additional resource that provides historical facts.
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