**Core Concept**
The question pertains to the clinical management and prognosis of complete moles in the context of gestational trophoblastic neoplasia (GTN). A complete mole is a type of molar pregnancy characterized by the presence of abnormal trophoblastic cells and a lack of fetal tissue. The risk of progression to persistent GTN is a critical consideration in the postnatal management of complete moles.

**Why the Correct Answer is Right**
The majority of complete moles do not progress to persistent GTN. This is because the abnormal trophoblastic cells in a complete mole typically undergo regression after evacuation, and the risk of malignant transformation is relatively low. However, a small percentage of complete moles can persist and progress to GTN, which is a significant clinical concern due to its potential for metastasis and resistance to chemotherapy.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it overestimates the percentage of complete moles that progress to persistent GTN. While a small percentage of complete moles can persist, the majority do not progress to GTN.
**Option B:** This option is incorrect because it suggests that a higher percentage of complete moles progress to persistent GTN than is actually the case.
**Option C:** This option is incorrect because it implies that the majority of complete moles progress to persistent GTN, which is not supported by clinical evidence.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the risk of persistent GTN is higher in women with a history of complete mole who are over 40 years old or have a history of previous GTN.

**Correct Answer: D. 10-20%**