The correct answer is option 4: 91-92. This means that the percentage of water content in human blood plasma normally ranges between 91% and 92%. Blood plasma is the liquid component of blood, and it makes up about 55% of the total blood volume. It contains various substances including water, proteins, hormones, electrolytes, and waste products. Water is the largest component of blood plasma, accounting for a significant proportion of its volume. Maintaining a high water content in blood plasma is important for the transport of nutrients, waste materials, and hormones throughout the body. It also helps regulate body temperature and supports other essential bodily functions.