**Core Concept**
The question requires understanding of the effects of gunshot wounds on the surrounding tissues, specifically the presence of charring and cherry red discoloration, which are indicative of a close-range gunshot wound.

**Why the Correct Answer is Right**
In a close-range gunshot wound, the muzzle of the firearm is in contact with or very close to the skin, resulting in charring and carbonization of the skin and underlying tissues. The cherry red discoloration, also known as "resorcinol" or "charring" at the entry wound, is due to the deposition of unburnt gunpowder residues. This occurs because the heat from the muzzle blast causes the tissues to carbonize, resulting in a characteristic charring pattern. The fact that the weapon was firmly clasped in the right hand of the deceased further supports the notion of a close-range gunshot wound.

**Why Each Wrong Option is Incorrect**
* **Option A:** A gunshot wound fired at a distance greater than 6 inches (15 cm) would not typically result in charring and cherry red discoloration, making this a less likely explanation.
* **Option B:** A contact wound would result in more extensive charring and potentially a "russell's sign" or stippling around the entry wound, which is not mentioned in the scenario.
* **Option D:** A gunshot wound fired at a distance would not result in the weapon being firmly clasped in the hand, as the recoil would have been significant enough to dislodge the gun.

**Clinical Pearl / High-Yield Fact**
Remember the "4Ds" of close-range gunshot wounds: "Dirt, Dirts, Dents, and Dimpling" (stippling, carbonization, charring, and dimpling of the skin). The presence of these features, along with the weapon being firmly clasped in the hand, is highly suggestive of a close-range gunshot wound.

**Correct Answer:** C.