Which osmotic condition involves the combination of high osmolarity solutions?

The condition associated with high osmolarity solutions is hypertonic. In a hypertonic solution, the osmolarity is greater than that of the intracellular fluid of cells. This greater concentration of solutes outside the cell causes water to move out of the cell in order to balance the solute concentrations. As a result, the cell may become shriveled due to the loss of water.

In contrast, isotonic solutions have equal osmolarity compared to the cell and do not cause net movement of water in or out of the cell, while hypotonic solutions have lower osmolarity than the cell, leading to water influx and potential cell swelling or lysis. Isosmotic refers to solutions having the same osmotic pressure but does not explicitly indicate their solute concentrations being high, as the term can apply to solutions with isotonic properties as well.

Overall, hypertonic conditions highlight the effects of high osmolarity on cellular environments, making this the correct answer.