The correct answer is option 3, "Slightly Basic." pH is a measure of the acidity or alkalinity of a substance, and it is represented on a scale ranging from 0 to 14. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity or basicity. The pH of human blood is slightly basic, typically ranging between 7.35 and 7.45. This indicates that the blood is slightly more on the alkaline side of the pH scale. It is important for the blood pH to remain within this narrow range as deviations can lead to health issues. It is worth noting that if the blood pH were highly acidic or highly basic, it could be indicative of a serious medical condition.