What occurs to the liquid mixture in a distillation apparatus during the process?

During the distillation process, the liquid mixture is subjected to heating, which causes components with lower boiling points to vaporize. This vapor then travels through the apparatus, where it is subsequently cooled in a condenser, allowing it to condense back into a liquid. Thus, the key point of this process is that the liquid mixture is boiled to create vapor, which is then cooled and condensed. This method effectively separates components of the mixture based on their boiling points, making option C the accurate description of what happens during distillation. The other options do not accurately represent the physical changes that occur during this technique.