**Core Concept**
Postmortem lividity, also known as livor mortis, is the discoloration of the skin due to the pooling of blood in the dependent areas of the body after death. This phenomenon is critical in forensic medicine for determining various aspects of the circumstances surrounding death.

**Why the Correct Answer is Right**
The manner of death refers to the circumstances or events leading to the demise of an individual. Postmortem lividity, while useful in various medicolegal contexts, does not directly inform us about the manner of death. It cannot distinguish between a violent, natural, or accidental death. However, it can provide clues about the position of the body at the time of death, which is a different consideration.

**Why Each Wrong Option is Incorrect**
**Option A:** Postmortem lividity can indirectly suggest the cause of death elsewhere, such as a traumatic injury leading to hemorrhage and subsequent pooling of blood. However, this is not its primary medicolegal importance.
**Option B:** Postmortem lividity can help estimate the time since death, as it typically appears within a few hours after death and becomes more pronounced over time.
**Option D:** The position of the body at the time of death is indeed a relevant aspect that postmortem lividity can inform, as it indicates the dependent areas where blood has accumulated.

**Clinical Pearl / High-Yield Fact**
Remember that postmortem lividity is not the same as ante-mortem hemorrhage. Ante-mortem hemorrhage occurs before death and can be distinguished from postmortem lividity by its typically more rapid onset and its presence in areas not dependent on gravity.

**✓ Correct Answer: C. Manner of death**