**Core Concept**
Breech presentation is a type of fetal presentation where the baby's buttocks or feet are positioned to be born first, rather than the head. This can be a normal variation of fetal positioning, but it is associated with an increased risk of complications during delivery.

**Why the Correct Answer is Right**
The most common type of breech presentation is the frank breech, where the baby's buttocks are positioned to be born first, with the legs folded up towards the chest. This occurs when the baby's head is engaged in the pelvis, and the buttocks are the presenting part. The frank breech is the most common type of breech presentation because it is the most stable position, allowing the baby to maintain a relatively upright position in the uterus.

**Why Each Wrong Option is Incorrect**
* **Option A:** The footling breech, where the baby's feet are positioned to be born first, is less common than the frank breech and is associated with a higher risk of complications during delivery.
* **Option B:** The complete breech, where the baby is sitting cross-legged, is a less common type of breech presentation and is often associated with fetal distress or other complications.
* **Option C:** The kneeling breech is a rare type of breech presentation where the baby is positioned with its knees bent and its feet folded up towards its buttocks.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize the different types of breech presentations to determine the best course of action for delivery, as each type carries a unique set of risks and complications.

**Correct Answer: B. Complete breech is the second most common type of breech presentation.**