Final answer:
The correct tool for individuals with hypertension to monitor their blood pressure is C) A blood pressure monitor. It helps provide valuable data for managing the condition.
Step-by-step explanation:
Individuals with hypertension, commonly known as high blood pressure, are advised to monitor their blood pressure regularly to manage the condition effectively. Monitoring is essential since hypertension can lead to serious health issues such as heart disease and stroke, and is often referred to as the "silent killer" due to its lack of symptoms. The correct tool for individuals to monitor their blood pressure successfully is C) A blood pressure monitor. These devices are available at most pharmacies, are relatively inexpensive, easy to use, and can provide valuable diagnostic data that can aid in the treatment of hypertension, which may include lifestyle adjustments, dietary changes, and possibly medication.