**Core Concept**
In cases of dental trauma, especially tooth intrusion, the primary goal is to determine if the tooth will spontaneously erupt or not. The decision to intervene surgically or orthodontically depends on the tooth's movement after a certain period.

**Why the Correct Answer is Right**
The correct answer is to observe and allow the tooth to erupt without intervention, especially if the intrusion is minimal (2 mm in this case). This approach is based on the principle that teeth can spontaneously erupt after a traumatic injury, especially if the periodontal ligament is still intact. The American Association of Endodontists recommends a "wait and see" approach for teeth with minimal intrusion (less than 3 mm). This approach allows the tooth to re-erupt, reducing the risk of complications such as root resorption, ankylosis, or infection.

**Why Each Wrong Option is Incorrect**
**Option B:** Surgical repositioning and stabilization with endodontic intervention are generally recommended for teeth with more significant intrusion (more than 3 mm), not for minimal intrusion.

**Option C:** While repositioning the tooth may be necessary if no movement is evident after 2-4 weeks, endodontic intervention is usually not required unless the tooth is non-vital or has a history of previous endodontic treatment.

**Option D:** Similar to Option C, endodontic intervention is not necessary unless the tooth is non-vital or has a history of previous endodontic treatment.

**Clinical Pearl / High-Yield Fact**
The "2-3 mm rule" is a useful guideline for determining the need for surgical intervention in cases of tooth intrusion. Teeth with intrusion less than 3 mm can usually be managed conservatively, while those with more significant intrusion may require surgical repositioning.

**✓ Correct Answer: A. Observe and allow the tooth to erupt without intervention.**