**Core Concept**
Nonimmune hydrops fetalis (NIHF) is a condition characterized by the accumulation of fluid in two or more fetal compartments, such as the skin, pleura, pericardium, or placenta, without the presence of maternal immune antibodies against fetal red blood cells. This condition can result from various fetal and maternal causes.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the common causes of NIHF, which include congenital infections, chromosomal abnormalities, and fetal anemia due to various causes like twin-to-twin transfusion syndrome.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot determine its accuracy regarding NIHF.
**Option B:** Similarly, without specifics on option B, its relevance to NIHF cannot be assessed.
**Option C:** And option C's correctness in relation to NIHF also cannot be evaluated without more information.
**Option D:** The same applies to option D, as the details are not provided.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that NIHF has a broad range of etiologies, and identifying the underlying cause is crucial for managing the condition.

**Correct Answer:** Correct Answer: D. Parvovirus infection