**Core Concept**
The presence of antemortem burns can be determined by identifying specific signs of tissue damage and response that occur before death, as opposed to postmortem burns which occur after death. This involves understanding the physiological changes that occur in response to thermal injury.

**Why the Correct Answer is Right**
The correct answer involves finding evidence of charring at the edges of the burn, which is a sign of thermal injury progressing from the outside in. This is due to the Maillard reaction, a non-enzymatic browning reaction between amino acids and reducing sugars that occurs when proteins and sugars are exposed to high temperatures. The presence of this reaction indicates that the burn occurred while the individual was alive, as it would not have had time to progress in a postmortem setting. Additionally, the presence of eschar, a scab-like crust that forms on the skin due to the coagulation of proteins, also suggests an antemortem burn.

**Why Each Wrong Option is Incorrect**
**Option A:** Finding carbonized blood in the lungs is not a reliable indicator of antemortem burns, as it can also occur postmortem due to the inhalation of soot into the lungs after death.

**Option B:** The presence of charring on the soles of the feet is not a reliable indicator of antemortem burns, as it can also occur postmortem due to the burning of the body after death.

**Option C:** The presence of singeing on the eyebrows is not a reliable indicator of antemortem burns, as it can also occur postmortem due to the burning of the body after death.

**Clinical Pearl / High-Yield Fact**
The presence of eschar or charring at the edges of a burn, particularly in a completely charred body, is a key indicator of antemortem burns. This is because these changes occur rapidly and are not reversible postmortem.

**Correct Answer:** C.