**Core Concept**
Congenital rubella syndrome (CRS) is a condition that occurs when the rubella virus infects a pregnant woman, leading to various congenital abnormalities in the fetus. The most common presentation of CRS is a result of the virus's effect on the developing fetus, particularly during the first trimester.

**Why the Correct Answer is Right**
The most common presentation of congenital rubella syndrome is **congenital heart disease**, specifically patent ductus arteriosus (PDA), pulmonary artery stenosis, and ventricular septal defects (VSD). This is because the virus affects the development of the embryonic heart, leading to these abnormalities. The virus also affects the development of the inner ear, leading to hearing loss and deafness. Additionally, CRS can cause ophthalmological abnormalities, such as cataracts and microphthalmia.

**Why Each Wrong Option is Incorrect**
**Option A:** While congenital rubella syndrome can cause various eye abnormalities, such as cataracts and microphthalmia, these are not the most common presentation.
**Option B:** Hearing loss and deafness are common in CRS, but they are not the most common presentation.
**Option C:** While CRS can cause various developmental delays and intellectual disabilities, these are not the most common presentation.

**Clinical Pearl / High-Yield Fact**
The most common presentation of congenital rubella syndrome is congenital heart disease, particularly patent ductus arteriosus, pulmonary artery stenosis, and ventricular septal defects.

**Correct Answer:** C.