Final answer:
A typical eukaryotic cell's volume comprises around 50 to 70 percent cytosol, making option C (50%) the best answer from the given choices.
Step-by-step explanation:
The question asks about the percentage of a eukaryotic cell's volume that is made up of cytosol. To answer this, we need to understand that the cytosol is the liquid part of the cytoplasm, excluding the organelles, and is responsible for many cellular processes. The cytoplasm contains 70 to 80 percent water and is therefore a semi-solid consistency due to the proteins and other molecules within. Given this information, it is reasonable to infer that a significant volume of the cytoplasm is made up of cytosol. Hence, the approximate percentage of the volume of a typical eukaryotic cell comprised of cytosol is around 50 to 70 percent. Considering the options provided, option C, 50%, would be the closest answer.