**Core Concept**
The uterus is supported by a complex system of ligaments, muscles, and fasciae that maintain its position and facilitate its movements during pregnancy and childbirth. The main support of the uterus is provided by a specific ligament that connects the uterus to the pelvic sidewall.

**Why the Correct Answer is Right**
The cardinal ligaments, also known as the Mackenrodt's ligaments, are a group of ligaments that provide the primary support to the uterus. They are composed of fibromuscular tissue and are attached to the cervix, the vagina, and the pelvic sidewall. The cardinal ligaments play a crucial role in maintaining the uterine position, preventing uterine prolapse, and facilitating normal vaginal delivery. The uterosacral ligaments also contribute to uterine support, but the cardinal ligaments are the main stabilizers of the uterus.

**Why Each Wrong Option is Incorrect**
**Option B:** The round ligaments of the uterus also provide some support to the uterus, but they are not the main stabilizers. They are more involved in maintaining the uterine position during pregnancy and facilitating uterine involution after childbirth.
**Option C:** The broad ligament of the uterus is a fold of peritoneum that supports the uterus, but it is not a ligament in the classical sense and does not provide the primary support to the uterus.
**Option D:** The uterovesical ligament is a ligament that connects the uterus to the bladder, but it is not the main support of the uterus.

**Clinical Pearl / High-Yield Fact**
The cardinal ligaments are also known as the Mackenrodt's ligaments, and they are a key landmark in pelvic surgery, particularly in radical hysterectomy and pelvic lymphadenectomy.

**Correct Answer: A. Cardinal ligaments.**