**Core Concept**
The most common cause of breech presentation is related to **fetal positioning** and **uterine factors**. Breech presentation occurs when a baby's feet or buttocks are positioned to be born first, rather than the head. This can be influenced by various factors, including **placental location** and **amniotic fluid volume**.

**Why the Correct Answer is Right**
The correct answer is related to the fact that the most common cause of breech presentation is **prematurity**, as premature babies are more likely to be in a breech position due to their **small size** and **uterine space**. Other factors, such as **multiple gestations** and **uterine anomalies**, can also contribute to breech presentation.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not the most common cause.
**Option B:** Incorrect because it is not directly related to breech presentation.
**Option C:** Incorrect because it is not the primary factor.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that breech presentation can be associated with **increased risk of complications** during delivery, such as **fetal distress** and **umbilical cord prolapse**.

**Correct Answer:** D. Prematurity.