Answer
The surface area to volume ration defines (c) Its size.
Work Step by Step
A cell is basic structural and functional unit of life. A cell grows in size by up taking nutrient metabolize it inside its system and releases waste produced from its surface. As the cell grows in size its surface areas and volume increases.
Cell are usually small in size to have a proper flow of material. In a growing cell volume of the cell also increases that results in the lower surface area to volume ration hence inability to move freely.
Cell surface area to volume has nothing to do with the prokaryotic or eukaryotic type of cell neither it is not related to the animal or plant cell type. These terms only indicate cell types.
Thus , the surface area to volume ration defines (c) Its size.