Cell structure varies depending on its what?

The correct answer is function.

Explanation:

The structure of a particular cellular constituent has a lot to do with its activity. It can also be said that structure dictates function. Let us consider an example of chloroplast and mitochondria, it is only the compositions of these two organelles that permits the procedures of photosynthesis and cellular respiration to take place.  

In both the organelles, the existence of the membrane permits for compartments to develop. These compartments can exhibit distinct hydrogen ions concentration, and it is because of these differences in concentration the formation of essential substances takes place.  

the answer is c on e2020, bud.