**Core Concept**
Third-degree utero-vaginal prolapse involves the descent of the uterus and vaginal walls beyond the introitus, significantly impacting the quality of life. Management of such cases requires a multidisciplinary approach, considering reproductive desires and overall health.

**Why the Correct Answer is Right**
In a woman desiring future childbearing, the primary goal is to preserve the uterus and vaginal function while addressing the prolapse. A **sacral colpopexy** with mesh is a suitable option. This procedure involves attaching the vagina to the sacrum using a mesh, providing long-term support and preventing further descent. This approach allows for future vaginal delivery, as it does not involve hysterectomy.

**Why Each Wrong Option is Incorrect**
**Option A:** **Le Fort's colpocleisis** is a procedure that involves partial closure of the vagina and is typically reserved for postmenopausal women who do not desire future vaginal intercourse or childbearing.

**Option B:** **Hysterectomy** would eliminate the possibility of future childbearing and is generally not recommended as a first-line treatment for women desiring pregnancy.

**Option C:** **Manchester repair** is a type of anterior and posterior repair, which may not provide adequate support for third-degree prolapse and is not suitable for women desiring future vaginal delivery.

**Clinical Pearl / High-Yield Fact**
In managing utero-vaginal prolapse, it is essential to consider the patient's reproductive desires and overall health, as certain procedures may impact future fertility or vaginal delivery.

**Correct Answer:** C.