**Core Concept**
Recurrent epistaxis in a pediatric patient can be due to various factors, including anatomical abnormalities, hormonal influences, and underlying systemic conditions. In adolescents, hormonal fluctuations during puberty can lead to changes in the nasal mucosa, making it more susceptible to bleeding.

**Why the Correct Answer is Right**
The most likely cause of recurrent epistaxis in a 15-year-old female is **nasal turbinate hypertrophy due to hormonal influences**. During puberty, the levels of estrogen and progesterone surge, leading to increased nasal mucosal edema and hypertrophy of the nasal turbinates. This can cause the nasal septum to become more fragile and prone to bleeding. The nasal turbinates are the long, curved bones or cartilages in the nasal passages that warm, humidify, and filter the air we breathe.

**Why Each Wrong Option is Incorrect**
* **Option B:** **Atrophic rhinitis** is a condition characterized by chronic inflammation and atrophy of the nasal mucosa, which can lead to epistaxis. However, it is more common in older adults and is not typically associated with hormonal fluctuations.
* **Option C:** **Nasal septal deviation** can cause nasal obstruction and dryness, but it is not a direct cause of recurrent epistaxis in adolescents.
* **Option D:** **Leukemia** is a malignant disease of the blood and bone marrow that can cause epistaxis, but it is an uncommon cause of recurrent epistaxis in adolescents and would typically present with other systemic symptoms.

**Clinical Pearl / High-Yield Fact**
Adolescents with recurrent epistaxis should be evaluated for hormonal influences, including polycystic ovary syndrome (PCOS) and thyroid disorders, which can contribute to nasal turbinate hypertrophy and bleeding.

**Correct Answer:** C.