Final answer:
The correct ventilation rate when a pulse returns but the person is not breathing is 10 to 12 breaths per minute. Option (b) 1 breath per 6 sec is closest to the recommended rate for adult and adolescent patients in this situation.
Step-by-step explanation:
When CPR is initiated and the person's pulse returns, but they are not breathing, the correct ventilation rate should be 10 to 12 breaths per minute. This is around 1 breath every 5 to 6 seconds. The given options don't include the accurate answer, but option (b) 1 breath per 6 sec is closest to the recommended rate. Adult and adolescent rescue breaths, when a pulse is present but there is no breathing, are provided at this rate to ensure adequate oxygenation while minimizing the risk of hyperventilation, which could lead to potential breathing complications or injury.