**Core Concept**
Primary dentition, also known as baby teeth, begins to erupt in infants around 6 months of age, marking the start of teething. This process is influenced by the development of the primary teeth buds in the jawbone and the maturation of the surrounding alveolar bone.

**Why the Correct Answer is Right**
Teething is a natural process where the primary teeth erupt through the gums, guided by the eruption pathway of the tooth. The eruption of primary teeth is influenced by the growth and development of the jawbone, as well as the presence of adequate space for tooth eruption. The primary teeth buds develop in the jawbone between 3-5 months of age and begin to erupt through the gums between 6-12 months of age.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not provide a specific age range for primary dentition eruption.
**Option B:** This option is incorrect as it does not accurately reflect the typical age range for primary dentition eruption.
**Option C:** This option is incorrect as it does not provide a correct age range for primary dentition eruption.

**Clinical Pearl / High-Yield Fact**
It's essential for pediatricians and pediatric dentists to monitor the eruption of primary teeth and provide guidance on teething management to parents, including the use of teething toys and gels to alleviate discomfort.

**Correct Answer:** 6 months.