Answer: B. Call 911.
Explanation:
CPR Cardiopulmonary resuscitation can be define as the emergency procedure which involves the chest compression and artificial ventilation. This is done to preserve the function of brain. It is an initiative to restore the circulation of blood and breathing in a patient who is in condition of cardiac arrest.
The following are the steps of CPR:
1. Recognize the medical emergency.
2. Call 911.
3. Check the breathing of patient.
4. Compress the chest atleast 30 times.
5. Open the patient's airway.
6. Give two breaths to the patient.
7. Continue compression and artificial breathing till the help arrives.
According to the given situation, after providing the chest compression calling 911 will be appropriate step as a necessary immediate medical help is required in situations of cardiac arrest.