Acell can only grow so large in size, because
a. its ability to exchange materials would happen more quickly as the cell grows.
b. its surface-to-volume ratio decreases as the cell becomes larger.
c. its surface-to-volume ratio decreases as the cell becomes smaller.
d. its ability to exchange materials is affected by a growing surface-to-volume ratio.

A cell can only grow so large in size because its ability to exchange materials is affected by a growing surface-to-volume ratio. Nature designed cells to be small in size because of the network of membranes passing through it. If cells grow any bigger, membranes in it will not be able to pass through its different parts and perform their purpose.

A cell is a network composed of many organelles (e.g. mitochondria, nucleus), that communicate and work together to provide bodily functions. The cell is small so that communication between organelles will be faster and much easier. When cells are small they can be easily repaired when damaged and replicated when needed.