Answer:
Step-by-step explanation:
The correct answer is C. Hypertension is called "the silent killer" because it often has no symptoms, and people may not realize they have it until they experience a serious health complication, such as a heart attack or stroke. It is important to get regular blood pressure checks and manage hypertension to reduce the risk of these complications. Option A, B, and D are incorrect as they do not accurately describe hypertension.