**Core Concept**
The concept being tested is the management of impacted teeth, specifically the eruption of second molars in relation to the first molars. This scenario is a common occurrence in orthodontic and oral surgery, requiring careful consideration of the anatomy and growth patterns of the jaw.

**Why the Correct Answer is Right**
When second molars become impacted under the distal cusps of first molars, the most effective treatment approach is to extract the first molars. This is because the eruption of the second molars is often hindered by the presence of the first molars, which can cause ankylosis or impaction. By removing the first molars, the space is created for the second molars to erupt properly, reducing the risk of complications such as infection, damage to adjacent teeth, or the need for more extensive surgical intervention.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as extracting the second molars would not address the underlying issue of the first molars being in the way. This approach would likely lead to further complications and the need for more extensive treatment.
* **Option B:** This option is incorrect as orthodontic treatment alone may not be sufficient to resolve the impaction of the second molars. In some cases, orthodontic treatment may even exacerbate the issue, making extraction of the first molars a more viable option.
* **Option C:** This option is incorrect as not addressing the impaction of the second molars would likely lead to long-term complications such as infection, damage to adjacent teeth, or the need for more extensive surgical intervention.

**Clinical Pearl / High-Yield Fact**
In cases of impacted second molars, it is essential to assess the relationship between the second molars and the first molars, as well as the overall occlusion and growth patterns of the jaw. A thorough examination and diagnosis are crucial in determining the best course of treatment.

**Correct Answer: D. Extraction of the first molars is the best approach in this scenario, allowing for proper eruption of the second molars.**