What is a common size configuration for carrying rigid C-collars?

The correct answer is that a common size configuration for carrying rigid C-collars is three sizes. This is important because patients come in various shapes and sizes, and having multiple sizes available allows emergency responders to provide appropriate support and immobilization based on the individual's needs. The three common sizes typically include small, medium, and large, catering to pediatric and adult populations, thus ensuring optimal fit and efficacy in stabilizing cervical injuries. Having this range is crucial for effective patient care, improving safety during transport, and minimizing potential exacerbation of cervical spine injuries.