**Core Concept**
Acute hydrops fetalis is a severe condition characterized by abnormal fluid accumulation in two or more fetal compartments, leading to non-immune hydrops fetalis (NIHF). The pathogenesis involves underlying fetal anomalies, infections, or other conditions that disrupt normal fetal development.

**Why the Correct Answer is Right**
Acute hydrops fetalis is often associated with conditions that compromise fetal circulation, leading to cardiac dysfunction and subsequent fluid accumulation. This can be due to genetic anomalies such as congenital heart defects (e.g., tricuspid atresia), chromosomal abnormalities (e.g., Turner syndrome), or structural anomalies (e.g., diaphragmatic hernia). Infections such as parvovirus B19 can also cause NIHF by triggering anemia and subsequent cardiac dysfunction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is often associated with the pathogenesis of NIHF. For example, anemia of chronic disease can lead to cardiac dysfunction and subsequent fluid accumulation.

**Option B:** This option is also commonly linked to NIHF. Fetal infections, such as parvovirus B19, can trigger anemia and cardiac dysfunction, leading to NIHF.

**Option C:** This option is a classic cause of NIHF. Congenital heart defects, such as tricuspid atresia, can disrupt normal fetal circulation, leading to cardiac dysfunction and fluid accumulation.

**Clinical Pearl / High-Yield Fact**
A key aspect of NIHF pathogenesis is the disruption of normal fetal circulation, which can be caused by a variety of underlying conditions, including genetic anomalies, infections, and structural anomalies.

**Correct Answer: D.**