**Core Concept**
A bicornuate uterus is a congenital anomaly characterized by a uterus with two separate horns that are connected by a central notch or cleft. This condition is often diagnosed during pregnancy or in women experiencing reproductive difficulties. The key feature of a bicornuate uterus is the presence of diverging horns, which can lead to complications such as preterm labor, fetal malpresentation, and recurrent miscarriages.

**Why the Correct Answer is Right**
The correct answer, **B. Diverging horns**, is indicative of a bicornuate uterus because the diverging horns are a direct result of the incomplete fusion of the Müllerian ducts during embryonic development. The Müllerian ducts are the precursors to the female reproductive tract and normally fuse to form a single uterus. In the case of a bicornuate uterus, the fusion is incomplete, resulting in two separate horns that diverge from the center. This anatomical abnormality can lead to a range of clinical complications, including difficulties with pregnancy and childbirth.

**Why Each Wrong Option is Incorrect**
**Option A:** An intercornual angle of less than 75° is actually indicative of a septate uterus, not a bicornuate uterus. A septate uterus is characterized by a thin wall of tissue that separates the two horns of the uterus.

**Option C:** An intrafundal downward cleft of less than 1 cm is also indicative of a septate uterus, not a bicornuate uterus. A septate uterus is characterized by a thin wall of tissue that separates the two horns of the uterus.

**Option D:** Hysteroscopic resection is not a treatment for a bicornuate uterus. While hysteroscopic resection is a common treatment for septate uteri, it is not typically used to treat bicornuate uteri.

**Clinical Pearl / High-Yield Fact**
A key clinical pearl to remember is that the presence of diverging horns on imaging studies, such as ultrasound or MRI, is highly suggestive of a bicornuate uterus. This knowledge can help clinicians to identify and manage patients with this condition, reducing the risk of complications during pregnancy and childbirth.

**✓ Correct Answer: B. Diverging horns**