**Core Concept**
The question is testing the developmental milestones of infants, specifically the age at which they typically achieve the skill of rolling over. This milestone is an important indicator of normal motor skill development in infants.

**Why the Correct Answer is Right**
Rolling over is a significant milestone in infant development, typically achieved between 4-6 months of age. This skill requires the infant to develop sufficient strength, coordination, and control over their muscles, particularly in the upper body. The process involves a combination of the infant's ability to lift their head while on their stomach, rotate their shoulders, and use their arms to propel themselves over. This skill is essential for further motor development, as it allows the infant to transition from a prone to a supine position and vice versa.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is too early for infants to roll over. At 2 months, infants are still developing their neck muscles and have limited control over their upper body.
**Option B:** This option is incorrect because it is too late for infants to roll over. At 8 months, infants have already developed sufficient strength and coordination to roll over and may be able to sit up with support.
**Option C:** This option is incorrect because it is not a specific enough answer. While rolling over is a significant milestone, the exact age at which it is achieved can vary from infant to infant.

**Clinical Pearl / High-Yield Fact**
It is essential to note that developmental milestones can vary significantly from infant to infant, and some may require more time to achieve certain skills. However, if an infant is not rolling over by 6 months, it may be a cause for concern and warrants further evaluation by a pediatrician.

**Correct Answer:** C. 6 months