**Core Concept**
The shape of a stab wound is determined by the angle of entry and the force of the object causing the injury. The wound's morphology can provide valuable information about the mechanism of injury and the potential underlying cause.

**Why the Correct Answer is Right**
The shape of a stab wound is influenced by the angle at which the object enters the skin. A perpendicular entry typically results in a clean, linear wound, while a more oblique entry can produce a more irregular shape with multiple edges. The force of the object also plays a role, with more forceful entries resulting in larger, more irregular wounds. The shape of the object itself can also influence the wound's shape, with sharp, pointed objects like knives producing more linear wounds and blunt objects like screwdrivers producing more irregular wounds.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the shape of a stab wound is not solely dependent on the type of object used. While the object's shape can influence the wound's shape, it is not the primary determining factor.
**Option B:** This option is incorrect because the wound's shape is not solely dependent on the force of the object used. While more forceful entries can result in larger, more irregular wounds, the angle of entry also plays a critical role.

**Clinical Pearl / High-Yield Fact**
It is essential to carefully examine the shape and morphology of a stab wound to determine the angle of entry and potential underlying cause. This can provide valuable information for forensic analysis and help guide further investigation.

**Correct Answer: C. The angle of entry and force of the object.**