What is a common sign of approaching death?

The correct answer highlights a common physiological change that occurs as a person approaches death. Decreasing blood pressure is significant because it indicates that the body's systems are beginning to slow down and that there may be insufficient circulation to maintain normal organ function.

As the body nears the end of life, various organ systems, including the cardiovascular system, start to fail. A drop in blood pressure can be accompanied by other signs, such as reduced circulation to extremities, cool extremities, and a change in skin color, which ultimately reflects the reduced function of the heart and blood vessels as the individual transitions out of life.

The other choices represent different phenomena that are generally not associated with the end-of-life stage. Increased blood pressure can occur due to stress or pain but is not characteristic of approaching death. Rapid breathing might occur in certain situations but can also be linked to conditions like anxiety or respiratory distress rather than a direct sign of dying. Heightened alertness is often seen in certain medical conditions, but it is atypical for someone who is nearing death, as decreased responsiveness is generally observed instead.