**Core Concept**
Zonular cataracts are a type of congenital cataract characterized by opacification of the lens fibers in the zonular or lamellar region, typically affecting the posterior subcapsular area. This condition is associated with disruptions in lens fiber cell development during embryogenesis.

**Why the Correct Answer is Right**
In zonular cataracts, the lens fibers are not properly organized, leading to the formation of opacities. This is often due to genetic mutations affecting the expression of crystallin proteins, which are essential for maintaining lens transparency. The zonular region, where the lens fibers are most densely packed, is particularly susceptible to these disruptions, resulting in the characteristic opacification seen in zonular cataracts.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because zonular cataracts are not typically associated with systemic metabolic disorders.
**Option B:** This option is incorrect because zonular cataracts do not typically involve the entire lens, but rather are localized to the zonular region.
**Option C:** This option is incorrect because zonular cataracts are not typically associated with trauma or inflammation of the lens.

**Clinical Pearl / High-Yield Fact**
Zonular cataracts are often associated with other congenital anomalies, such as microphthalmia or coloboma, and may require early surgical intervention to prevent amblyopia.

**Correct Answer:** C.