Final answer:
The fluid in the extracellular fluid compartment, plasma comprises approximately C. 20%
Step-by-step explanation:
Extracellular fluid is a major component of the body's water content, accounting for approximately one-third. Within the extracellular fluid, plasma is responsible for about 20% of the total body weight. Plasma is the fluid component of blood and contains various substances, including proteins, electrolytes, nutrients, gases, and waste materials.
This means that out of the total body weight, approximately 20% is occupied by plasma, while the remaining 80% consists of other fluids and tissues. So therefore the correct answer is C. 20%.