Final answer:
The title 'How to Protect Yourself from Bicycle Injuries' clearly shows the informational text's purpose as it aligns specifically with the intent to educate readers on safety measures to avoid injuries while bicycling.
Step-by-step explanation:
The title of an informational text message that clearly indicates the purpose of the text is to inform readers about how to protect themselves from bicycle injuries would be “How to Protect Yourself from Bicycle Injuries”. This title is direct and to the point, signaling to readers that the content will provide information on safety precautions and techniques to prevent injuries while bicycling. In contrast, titles such as “major bicycle races in the world,” “the health benefits of bicycling,” and “why cities need to make streets more bike-friendly” suggest different informational content, focusing on events, health aspects, and urban planning, respectively. Therefore, these titles would not be as suitable for an informative text with the purpose of educating readers on injury prevention.