## Core Concept
The recommended daily protein intake varies by age, sex, and activity level. For adolescents, protein is crucial for growth and development. The Recommended Dietary Allowance (RDA) for protein is usually expressed in grams per kilogram of body weight per day.

## Why the Correct Answer is Right
The RDA for protein for children and adolescents is generally recommended to be about 0.8-1.2 grams of protein per kilogram of body weight per day, but specific recommendations can vary slightly by age and organization. For a 13-15 year old female, a commonly recommended daily intake is around 46 grams of protein per day, which aligns with option suggesting a similar value.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is lower than the recommended daily intake for a 13-15 year old female, which could lead to inadequate growth and development.
- **Option B:** This is also not the correct recommended daily intake; it's either too high or too low compared to established nutritional guidelines.
- **Option D:** This option does not match the established guidelines for protein intake in adolescents.

## Clinical Pearl / High-Yield Fact
A key point to remember is that protein requirements can vary based on activity level and specific health conditions. However, for a general 13-15 year old female, aiming for about 46 grams of protein per day is a reasonable guideline.

**Correct Answer: B. 46**