**Core Concept**
The question pertains to root end preparation, a crucial step in endodontic therapy. Root end preparation involves the removal and shaping of the apical portion of a tooth's root to create a smooth, clean surface for the placement of a root end filling material. This process aims to promote healing and prevent complications.

**Why the Correct Answer is Right**
The correct answer is related to the type of root end preparation that is most commonly performed. The root end is prepared using a combination of hand and rotary instruments to create a smooth, beveled surface. The shape and size of the preparation are critical in determining the success of the root end filling. The most common type of root end preparation is the **apicoectomy**, which involves the removal of the apical portion of the root and the creation of a beveled surface.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not describe a common method of root end preparation. While some procedures may involve the use of lasers, this is not a standard approach in root end preparation.
**Option B:** This option is incorrect because it does not accurately describe the type of root end preparation that is most commonly performed. While some procedures may involve the use of reamers, this is not a standard approach in root end preparation.
**Option C:** This option is incorrect because it does not accurately describe the type of root end preparation that is most commonly performed. While some procedures may involve the use of burs, this is not a standard approach in root end preparation.

**Clinical Pearl / High-Yield Fact**
A key point to remember when performing root end preparation is to use a combination of hand and rotary instruments to create a smooth, beveled surface. This helps to promote healing and prevent complications.

**Correct Answer: C. Apicoectomy**