**Core Concept**
The underlying principle being tested is the management of endometrial hyperplasia with atypia in a post-menopausal female, which is a precancerous condition. **Endometrial hyperplasia** refers to the excessive proliferation of cells in the endometrium, and **atypia** indicates the presence of abnormal cells, increasing the risk of **endometrial carcinoma**.

**Why the Correct Answer is Right**
Given the information, the correct management would involve a procedure to remove the abnormal endometrial tissue to prevent progression to cancer. This typically involves a **hysterectomy**, especially in post-menopausal women, as it definitively treats the condition by removing the uterus.

**Why Each Wrong Option is Incorrect**
**Option A:** Might be incorrect because it could represent a less invasive approach that might not be appropriate for atypia.
**Option B:** Could be incorrect as it may not be the standard next step after a diagnosis of atypia.
**Option C:** Might be incorrect because, while it could be a step in management, it may not be the immediate next step after diagnosis.

**Clinical Pearl / High-Yield Fact**
In post-menopausal women, any **endometrial hyperplasia with atypia** is considered a significant risk factor for **endometrial cancer**, and thus, aggressive management is often recommended. The key is to prevent the progression to malignancy.

**Correct Answer:** D. Hysterectomy.