**Core Concept**
The question is testing knowledge of **strangulation methods**, specifically the use of a ligature to constrict the neck. This is a key concept in **forensic medicine**, where understanding the mechanisms of injury is crucial for investigation and legal proceedings.

**Why the Correct Answer is Right**
The correct answer relates to a specific method of strangulation where a thin string or ligature is used, which is characteristic of **ligature strangulation**. This method involves encircling the neck with a rope, string, or similar object, leading to constriction of the blood vessels and airway.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not specifically describe the use of a thin string or ligature.
**Option B:** Incorrect as it is not directly related to the method of strangulation being described.
**Option C:** Incorrect because it does not accurately depict the scenario of using a loop of string around the neck.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **ligature strangulation** often leaves a distinct mark on the neck, which can be an important clue in forensic investigations. The mark's appearance can vary depending on the material used for the ligature.

**Correct Answer:** D. Ligature strangulation.