**Core Concept**
The question is testing the knowledge of a congenital abnormality of the uterus, which refers to an abnormal formation or development of the uterus during embryogenesis. This can lead to various anomalies in the structure and function of the uterus.

**Why the Correct Answer is Right**
The correct answer is likely **Müllerian duct anomaly**, specifically a septate uterus. This occurs due to an incomplete resorption of the Müllerian ducts during embryonic development, leading to a partial or complete septation of the uterus. The Müllerian ducts are paired embryonic structures that give rise to the female reproductive system, and their abnormal development can result in various congenital uterine anomalies.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a specific congenital uterine anomaly. It's possible that the question is incomplete, but based on the options, we can consider other common anomalies.
* **Option B:** Although a unicornuate uterus is a congenital anomaly of the uterus, it's not the most common type. In a unicornuate uterus, one Müllerian duct fails to develop, resulting in a single-sided uterus.
* **Option C:** A bicornuate uterus is another congenital anomaly, but it's not the same as a septate uterus. In a bicornuate uterus, the uterus has two horns, but they are connected by a thin wall of tissue.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the type of congenital uterine anomaly can significantly impact reproductive outcomes. For example, women with a septate uterus may experience recurrent miscarriages or preterm labor due to the abnormal uterine shape and function.

**Correct Answer: C. Bicornuate uterus**