Which of the following heart rates would be of concern in an otherwise healthy 10-year-old patient?

Rationale: A. In a healthy 10-year-old, a heart rate of 60 beats per minute at rest is concerning because the normal resting heart rate for this age group ranges from approximately 70–120 bpm. A heart rate below 70 bpm (bradycardia) may indicate an underlying cardiac conduction issue or other pathology, particularly if symptomatic. B. 73 bpm is within the normal range for a 10-year-old at rest. C. 100 bpm is normal and can be expected depending on activity, anxiety, or mild stress. D. 120 bpm is at the upper limit of normal for a 10-year-old and may be appropriate depending on recent activity or emotional state.