**Core Concept**
The dental age of a patient is determined by the stage of development of their teeth, including the formation and eruption of primary and permanent teeth. This assessment is crucial in pediatric dentistry and orthodontics. The stages of tooth development include bud, cap, bell, and maturation stages, with root formation being a key indicator of dental age.

**Why the Correct Answer is Right**
Given the information provided, the patient's teeth are at various stages of development. The completion of roots of mandibular incisors and near completion of roots of maxillary lateral incisors, along with significant root development of other teeth, suggest a specific dental age. The root resorption of primary canines and molars and the development of their permanent successors also indicate a particular stage of dental development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option would typically represent an earlier stage of dental development, with less root completion and development of permanent successors.
**Option B:** Similarly, this option might represent a stage with less advanced root development of the permanent teeth.
**Option D:** This option could represent a later stage of dental development, with more advanced root completion and possibly more teeth in the mouth.

**Clinical Pearl / High-Yield Fact**
Dental age is an important factor in orthodontic treatment planning, as it helps in predicting the growth pattern and development of the dentition. Accurate assessment of dental age requires careful evaluation of tooth development stages.

**Correct Answer:** C. 10 years