**Core Concept**
The pH of amniotic fluid is a critical indicator of fetal well-being, reflecting the balance between fetal acid-base status and maternal acid-base status. The normal pH of amniotic fluid is slightly alkaline, which is essential for fetal development and gas exchange.

**Why the Correct Answer is Right**
The pH of amniotic fluid is maintained by the buffering action of bicarbonate and phosphate buffers. The fetal kidneys excrete excess hydrogen ions into the amniotic fluid, while the maternal kidneys excrete excess bicarbonate ions. The pH of amniotic fluid is also influenced by the level of fetal metabolism, with an increased level of fetal metabolism leading to an increase in the pH of amniotic fluid. The normal pH of amniotic fluid ranges from 7.10 to 7.30.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the pH of amniotic fluid is not acidic, which would indicate fetal distress.
**Option B:** This option is incorrect because the pH of amniotic fluid is not neutral, which would indicate a lack of fetal metabolism.
**Option C:** This option is incorrect because the pH of amniotic fluid is not alkaline, which would indicate fetal alkalosis.

**Clinical Pearl / High-Yield Fact**
A pH of amniotic fluid below 7.10 or above 7.30 can indicate fetal distress or acid-base imbalance, which requires prompt medical attention.

**Correct Answer:** C. 7.20