Final answer:
Osmolality is a measure reflecting the concentration of solutes per kilogram of solvent, providing a more accurate assessment of body fluid osmotic activity than osmolarity, which is influenced by temperature and pressure.
Step-by-step explanation:
Osmolality is preferred over osmolarity in the clinical assessment of individuals because it is a more accurate measure of the osmotic activity in body fluids. This is due to the fact that it is less affected by temperature and pressure changes and correlates more closely with physiological conditions. When comparing two solutions, Solution B likely is the more concentrated solution because osmolality measures the moles of solute per kilogram of solvent. This means that the number of dissolved particles in urine or blood, for instance, can indicate the body's state of hydration and the kidney's ability to concentrate or dilute urine, which is essential for proper body function.