**Core Concept**
The body weight method is a widely used approach to calculate the initial fluid requirement in pediatric patients. This method involves estimating the fluid needs based on the child's weight, which helps in preventing dehydration and ensuring adequate organ perfusion.

**Why the Correct Answer is Right**
For children, the initial fluid requirement is calculated using the formula: 100 mL/kg/day for the first 10 kg of body weight, plus 50 mL/kg/day for the next 10 kg, and 20 mL/kg/day for each kilogram above 20 kg. A child weighing 14 kg falls into the 10-20 kg weight category. Therefore, the fluid requirement for the first 10 kg is 100 mL/kg/day * 10 kg = 1000 mL, and for the next 4 kg (14 kg - 10 kg), it is 50 mL/kg/day * 4 kg = 200 mL. The total fluid requirement for the first 24 hours is 1000 mL + 200 mL = 1200 mL.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not take into account the child's weight and the specific formula for calculating fluid requirements.
* **Option B:** This option is incorrect as it does not accurately calculate the fluid requirement for a child weighing 14 kg.
* **Option C:** This option is incorrect as it does not follow the established formula for calculating initial fluid requirements in pediatric patients.
* **Option D:** This option is incorrect as it does not provide a clear calculation for the fluid requirement based on the child's weight.

**Clinical Pearl / High-Yield Fact**
When using the body weight method to calculate initial fluid requirements, it's essential to remember that the formula is based on the child's weight in kilograms, and the fluid requirements are calculated in milliliters per day. This approach helps in ensuring that the child receives adequate fluid to prevent dehydration and maintain organ perfusion.

**Correct Answer:** B. 1200 mL