Final answer:
The percentage of the body surface burned is determined by the rule of nines; adding 9% for the head and face to 18% for the anterior trunk results in 27% total body surface area burned.
Step-by-step explanation:
To determine the percentage of body surface area that has been burned in the given scenario, we can utilize the rule of nines. For a 5-year-old child, the typical distribution of percentages differs slightly from those of an adult, but in general, for both the head and neck, it is roughly 9% of the body surface area and for the anterior trunk, it's 18%. Therefore, we can estimate:
- Head and neck: 9%
- Anterior trunk (front of the torso): 18%
When we add the percentages together, 9% (head and face) + 18% (anterior trunk), we get an estimated 27% of the body surface area burned. This is the most appropriate answer given the options provided.