A short passage states that prevention depends on early detection. What is the main idea?

• A. Prevention relies on curative treatment alone.
• B. Early detection is key to preventing disease progression.
• C. Early detection is optional for most diseases.
• D. Prevention is unrelated to detection.

Answer: (B)

The main idea is that preventing illness hinges on catching problems early. When a condition is detected early, timely interventions can stop it from advancing and reduce the risk of more serious complications. The passage emphasizes this direct link between early detection and successful prevention. The other statements contradict this relationship: prevention isn’t about waiting for a cure after disease develops, early detection isn’t optional, and prevention isn’t unrelated to detection.