**Core Concept**
The pH of amniotic fluid is a critical parameter that reflects the acid-base status of the fetus. The normal pH range of amniotic fluid is slightly alkaline, which is essential for fetal development and well-being.

**Why the Correct Answer is Right**
The pH of amniotic fluid is maintained by the buffering capacity of bicarbonate and chloride ions, with a pH range of approximately 7.05 to 7.35. This slightly alkaline pH is crucial for the proper functioning of fetal enzymes and the prevention of acidosis. The pH of amniotic fluid is also an important indicator of fetal well-being, with deviations from the normal range suggesting potential complications such as intrauterine growth restriction or fetal distress.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it suggests a pH range that is too acidic, which would be detrimental to fetal development.
**Option B:** This option is incorrect as it suggests a pH range that is too alkaline, which would also be harmful to the fetus.
**Option C:** This option is incorrect as it suggests a pH range that is not within the normal range, which would indicate potential complications.

**Clinical Pearl / High-Yield Fact**
The pH of amniotic fluid is an important parameter that should be monitored during pregnancy, especially in high-risk pregnancies. A pH range outside of 7.05 to 7.35 may indicate fetal compromise and require prompt medical attention.

**Correct Answer: D. 7.15**