**Core Concept**
The interparietal suture is a fibrous joint located between the two parietal bones of the skull, which fuse together during the process of cranial ossification.

**Why the Correct Answer is Right**
The interparietal suture is a type of fibrous joint that develops during fetal development and remains patent until around 18-24 months of age, when the two parietal bones fuse together. This suture is a remnant of the separate development of the parietal bones from the parietal plates of the neural crest.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the interparietal suture is located between the parietal bones, not between the frontal bones.

**Option B:** This option is incorrect because the coronal suture is located between the frontal and parietal bones, not between the parietal bones themselves.

**Option C:** This option is incorrect because the sagittal suture is located between the two parietal bones, but it is actually located along the midline of the skull, whereas the interparietal suture is located more laterally.

**Clinical Pearl / High-Yield Fact**
The fusion of the parietal bones at the interparietal suture is a normal part of cranial development, and failure of this fusion can lead to a condition known as craniosynostosis.

**Correct Answer: C. Sagittal suture.**