Frequency of breech presentation in pregnancy at term is :

**Core Concept**
The frequency of breech presentation in pregnancy at term is an important obstetric concept, as it can impact delivery outcomes. Breech presentation occurs when a baby's feet or buttocks are positioned to be born first, rather than the head. This can happen for various reasons, including placenta previa or multiple gestations.

**Why the Correct Answer is Right**
The correct answer is based on the fact that breech presentation is less common at term, occurring in about 3-4% of pregnancies. This is because most babies move into a head-down position as the pregnancy progresses. The exact percentage can vary depending on the population being studied and the gestational age.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the frequency is too high.
**Option B:** This option might seem plausible but does not reflect the most accurate percentage.
**Option D:** This option is also incorrect as it does not match the known frequency of breech presentation at term.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that breech presentation is more common in preterm pregnancies, and the frequency decreases as the gestation advances. Identifying breech presentation is vital for planning the appropriate mode of delivery.

**Correct Answer:** B. 3-4%