Which of the following symptoms would warrant calling 911?

Chest pain is a symptom that often indicates a potential medical emergency, particularly in the context of cardiac issues such as a heart attack. When someone experiences chest pain, it can be a signal that the heart is not receiving enough blood, which can lead to severe and life-threatening consequences. Given the seriousness of this symptom, it is essential to seek immediate medical attention by calling 911.

In contrast, while sudden headaches may be concerning and require attention, they are not as universally critical as chest pain unless accompanied by other alarming symptoms. Stomach aches can result from various benign issues, and minor cuts are typically not emergencies, as they can usually be managed with basic first aid. Therefore, recognizing chest pain as a potential life-threatening condition is crucial, making it the appropriate choice that warrants calling for emergency services.