Question

which source would be most helpful in researching this question? have helmet laws decreased the number of childhood head injuries? a. a medical journal article titled cause and treatment of childhood concussions b. the biography of a professional cyclist whose career ended after a head injury c. a newspaper article titled number of concussions in counties with and without helmet laws d. a website featuring an online petition to enact helmet laws in every state

Explanation:

To determine the most helpful source for researching if helmet laws decreased childhood head injuries, we analyze each option:

• Option A focuses on causes and treatments of concussions, not the impact of helmet laws.
• Option B is a personal biography, not relevant to the broader impact of helmet laws on childhood head injuries.
• Option C directly compares concussion numbers in areas with and without helmet laws, which is relevant to the research question.
• Option D is a petition website, which provides advocacy rather than research - based data on the impact of helmet laws.

Answer:

C. A newspaper article titled "Number of Concussions in Counties With and Without Helmet Laws"