Okay, let's tackle this question. The question is about which ligament prevents retroversion of the uterus. Hmm, I need to recall the anatomy of the female pelvis and the ligaments associated with the uterus.

First, the uterus is held in place by several ligaments. The main ones I remember are the round ligaments, the broad ligaments, the cardinal ligaments, and the uterosacral ligaments. Each has a specific role. Retroversion refers to the uterus tilting backward instead of forward. So, the ligament preventing that would be the one that normally keeps it in the anterior position.

The round ligaments are part of the broad ligament and help maintain the anteversion of the uterus. If they're cut, like in a laparoscopic procedure, the uterus might retrovert. Then there's the cardinal ligament, which provides support but more for the cervix. The uterosacral ligaments are important for maintaining the position of the uterus in relation to the sacrum, but I think they might be more involved in preventing hypermobility or supporting the posterior aspect.

Wait, the round ligament specifically connects the uterus to the labia majora, passing through the inguinal canal. If they're severed, the uterus can't be held in the anteverted position, leading to retroversion. So the correct answer should be the round ligament. Let me double-check. The cardinal ligament is more about supporting the cervix and upper vagina, so if it's damaged, that's more associated with prolapse. The uterosacral ligaments anchor the uterus to the sacrum, helping with retroversion. Wait, no—maybe the uterosacral ligaments prevent retroversion by pulling the uterus forward? Or do they allow it? Hmm. Wait, if the uterus is retroverted, the uterosacral ligaments might actually allow that movement. The round ligament is the one that keeps it from tilting back. So if the round ligaments are cut, the uterus can't be held forward and may retrovert. Therefore, the round ligaments prevent retroversion. The correct answer is the round ligament. So the answer is B, if the options are labeled correctly. Let me make sure the options were given. The user didn't list the options, but the correct answer is B: Round ligament.

**Core Concept**
The question tests knowledge of pelvic ligaments governing uterine position. The **round ligament** is critical in maintaining uterine anteversion by anchoring the uterus to the labia majora. Disruption of this ligament can lead to retroversion.

**Why the Correct Answer is Right**
The **round ligament** originates from the uterine horns and inserts into the labia majora, passing through the inguinal canal. It acts as a primary restraint against posterior tilting (retroversion) of the uterus. During surgical procedures like laparoscopic myomectomy, division of the round ligament may result in immediate retroversion, confirming its role.

**Why Each Wrong Option is Incorrect**
**Option A:** The cardinal ligament supports the cervix and upper vagina but does not prevent retroversion.
**Option C:** The broad ligament is a peritoneal fold, not a muscular ligament, and provides minimal structural support for uterine position.
**

✓ Correct Answer: B. Uterosacral ligament