Final answer:
The maximum weight a person should carry using a backboard depends on the manufacturer's specifications and is typically carried by multiple responders to ensure safety. There is no clear answer provided for the options given in this question.
Step-by-step explanation:
When considering the maximum weight a person should carry using a backboard, it is important to recognize that this question does not directly relate to a specific physics concept or problem listed. The backboard in question is likely a spinal immobilization device used in emergency medical services, and the weight limitations would be dependent on the manufacturer's specifications for the device, as well as the combined strength of the responders carrying it.
Health and safety guidelines generally suggest that the weight carried by a single person should not exceed 50 lbs or 22.7 kg. However, backboards are typically carried by multiple responders, which allows for more weight to be distributed and carried safely.
Without specific context or guidelines from the manufacturer, it's not possible to provide a definitive answer to the maximum weight that a backboard can carry. It's always recommended to follow the manufacturers' guidelines and local protocols for safe lifting and carrying procedures.