**Core Concept**
The **total body surface area (TBSA)** is a critical measure in assessing the extent of burns or other skin injuries, with different body parts contributing varying percentages. In pediatric patients, the proportion of TBSA for each body part changes with age due to growth and development. The **Lund-Browder chart** is often used to estimate TBSA in children.

**Why the Correct Answer is Right**
Given the age range of 10-14 years, the back's contribution to TBSA is approximately 16%. This percentage reflects the growth pattern in this age group, where the proportions of body parts change significantly. The **Lund-Browder chart** accounts for these changes, providing a more accurate estimation of TBSA in children of different ages.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the TBSA of the back in this age group.
**Option B:** This option overestimates the TBSA of the back.
**Option D:** This option also does not accurately represent the TBSA of the back for a 10-14 year old.

**Clinical Pearl / High-Yield Fact**
Remembering the **Lund-Browder chart** percentages for different age groups is crucial for accurately assessing burn injuries in pediatric patients. For children around 10-14 years old, the back contributes approximately 16% to the TBSA.

**Correct Answer:** C. 16%