Final answer:
The effect of a solution on osmotic movement of water is described by its Tonicity, which is related to the solution's osmolarity and dictates the direction of water flow across a semi-permeable membrane.
Step-by-step explanation:
The effect of a solution on the osmotic movement of water is B) Tonicity. Tonicity refers to the ability of an extracellular solution to affect the volume of a cell by determining how water will move across a cell membrane. This movement occurs because of differences in osmolarity, which is the measure of total solute concentration within the solution. When solutions of two different osmolarities are separated by a semi-permeable membrane, water will move from the area of lower osmolarity (more water, fewer solutes) to the area of higher osmolarity (less water, more solutes). The three terms to describe solution conditions related to tonicity are hypotonic, isotonic, and hypertonic.