**Core Concept**
Amniotic fluid is a clear, pale yellow liquid that surrounds the fetus during pregnancy, providing cushioning, temperature regulation, and facilitating fetal movement. Its volume is essential for fetal development and well-being.

**Why the Correct Answer is Right**
At 12 weeks of gestation, the amount of amniotic fluid is approximately 30-50 mL. This is due to the balance between the production of fetal urine (the primary source of amniotic fluid), fetal swallowing, and the absorption of fluid by the placenta and fetal skin. The amniotic fluid index (AFI) is used to measure the volume of amniotic fluid, but at 12 weeks, the focus is on the overall volume rather than the AFI.

**Why Each Wrong Option is Incorrect**
* **Option A:** There is no specific measurement or estimate provided for this option, making it an unclear choice.
* **Option B:** This option is likely incorrect as it does not accurately represent the volume of amniotic fluid at 12 weeks of gestation.
* **Option C:** This option may be a plausible estimate, but without further context, it is difficult to determine its accuracy in comparison to the correct answer.

**Clinical Pearl / High-Yield Fact**
The volume of amniotic fluid at 12 weeks of gestation is relatively low, but it is essential for fetal development and well-being. Abnormalities in amniotic fluid volume can be indicative of fetal anomalies or complications.

**Correct Answer: C. 30-50 mL.**