**Core Concept**
The round ligament of the uterus is a fibromuscular band that plays a crucial role in maintaining the uterus in its anteverted position. It originates from the uterine horns, near the base of the uterus. The **anatomical relationship** between the round ligament and the uterine tube is essential for understanding its site of attachment.

**Why the Correct Answer is Right**
The round ligament of the uterus passes through the inguinal canal and attaches to the labia majora, but its origin and initial course are closely related to the uterine tube. Specifically, it arises from the uterine horns, which are the areas where the uterine tubes join the uterus. The correct answer reflects this anatomical relationship, indicating that the round ligament attaches to the **uterine horn**, near the junction with the uterine tube.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the anatomical relationship between the round ligament and the uterine tube.
**Option B:** This option is also incorrect as it does not specify the correct site of attachment.
**Option C:** Similarly, this option is incorrect due to its inaccuracy regarding the attachment site.

**Clinical Pearl / High-Yield Fact**
The round ligament's attachment site is crucial for understanding uterine anatomy and its implications in various clinical scenarios, such as **ectopic pregnancy**. Remembering the precise attachment site can help in diagnosing and managing conditions related to the uterine tube and surrounding structures.

**Correct Answer:** D. The uterine horn, near the junction with the uterine tube, is not provided, however, based on anatomical knowledge, the round ligament of the uterus attaches to the uterine horn.