**Core Concept**
Pugilistic attitude refers to the characteristic posturing of a deceased body, often seen in cases of heat-induced rigor mortis, where the body assumes a defensive position resembling a boxer's stance. This phenomenon occurs due to the contraction of muscles in the absence of neural control, leading to an unnatural arrangement of the body's limbs.

**Why the Correct Answer is Right**
The pugilistic attitude is a result of the heat-induced contraction of muscles, particularly in the arms and legs. This contraction occurs due to the denaturation of proteins and the subsequent formation of rigor mortis, which causes the muscles to stiffen and maintain an unnatural position. The body's inability to relax the muscles leads to the characteristic posture, with the arms often flexed and the hands clenched into fists.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the cause of the pugilistic attitude. While environmental factors may contribute to the development of rigor mortis, they are not the primary cause of the characteristic posturing.
**Option B:** This option is incorrect because it is too vague and does not specifically address the mechanisms underlying the pugilistic attitude. While the body's musculature is indeed affected, the specific contraction of muscles leading to the characteristic posture is not adequately explained.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the pugilistic attitude can be influenced by various factors, including the temperature at which the body is exposed, the duration of exposure, and the presence of any underlying medical conditions. A thorough understanding of these factors is crucial for accurate interpretation of the body's posture in forensic examinations.

**Correct Answer: C.**