Final answer:
Plasma is the body compartment with the lowest quantity of water, as it is a smaller portion of the extracellular fluid compared to interstitial fluid and is significantly less voluminous than the intracellular fluid.
Step-by-step explanation:
Among the options provided, water is found in the lowest quantity in plasma (D. Plasma). Plasma is the fluid component of blood and makes up a smaller portion of the body's water compared to intracellular fluid and interstitial fluid. Intracellular fluid (ICF) is the largest compartment constituting about 60% of total body water, while extracellular fluid (ECF), which includes plasma, constitutes about 20% of the body weight. Plasma, which communicates freely with interstitial fluid, is a small component of the ECF, making it the compartment with the lowest amount of water compared to the cytosol of cells (ICF) or the interstitial fluid which bathes all of the body's cells except blood cells.