## **Core Concept**
The question tests understanding of gestational trophoblastic disease (GTD), specifically the progression from a complete hydatidiform mole to an invasive mole. This progression involves the invasion of molar tissue into the myometrium.

## **Why the Correct Answer is Right**
The conversion of a complete hydatidiform mole into an invasive mole is characterized by the invasion of molar tissue into the myometrium, which can lead to serious complications, including bleeding and the potential for metastasis. This process is part of the spectrum of gestational trophoblastic neoplasia (GTN). The indication of such conversion would typically involve evidence of deep myometrial invasion or vascular invasion, which can be detected through imaging studies or histopathological examination.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While not explicitly listed, if an option suggests a method or criterion not applicable to diagnosing invasive mole (such as a specific tumor marker elevation without considering clinical or imaging evidence of invasion), it would be incorrect because it doesn't directly relate to the demonstration of invasion.
- **Option B:** If an option mentions a criterion like elevated beta-hCG levels persisting or rising after evacuation of the mole, it would not be incorrect on its own since it can indicate persistent gestational trophoblastic disease, which may include invasive mole.
- **Option C:** Similarly, if another option refers to the presence of metastatic disease, it would also be relevant because invasive moles can metastasize.
- **Option D:** The correct answer, likely referring to a specific scenario or criterion not directly indicative of invasive mole conversion, needs to be identified based on the specifics of gestational trophoblastic disease pathology.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the diagnosis of an invasive mole often relies on a combination of clinical, radiological, and histopathological findings. Specifically, ultrasound showing a uterine mass with myometrial invasion, along with persistent elevation of beta-hCG levels post-evacuation, are critical indicators.

## **Correct Answer: D.**