**Core Concept**
The question is testing the knowledge of fingerprint patterns and their classification. Fingerprint patterns are formed by the ridges and valleys on an individual's fingertips, which are unique to each person.

**Why the Correct Answer is Right**
The correct answer is the most common fingerprint pattern, which is characterized by a repeating pattern of loops, arches, and whorls. This pattern is formed by the interaction of genetic and environmental factors during fetal development. The ridges on the fingertips are made up of a protein called keratin, which is produced by the cells in the epidermis. The unique pattern of ridges and valleys on an individual's fingertips is determined by the way these cells interact and arrange themselves during development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the second most common fingerprint pattern is not as prevalent as the correct answer.
**Option B:** This option is incorrect because it is not a recognized category of fingerprint patterns.
**Option C:** This option is incorrect because it is a rare type of fingerprint pattern.

**Clinical Pearl / High-Yield Fact**
It's worth noting that fingerprint patterns can be influenced by various factors, including genetics, age, and environmental factors. For example, fingerprint patterns can change over time due to wear and tear, injury, or disease.

**Correct Answer: C. Arch type. Arch type is the most common fingerprint pattern, accounting for approximately 5-10% of the population.**