Increasing the cell's volume would reduce the efficiency of the diffusion of materials through the plasma membrane into the cytoplasm of the cell.
On the other hand, increase the surface area and decreasing the volume oft the cell would increase the rate of diffusion across the plasma membrane.
I believe the answer you are looking for has to do with cells, they are the basic building block of life and are the smallest life that can support itself.
RNA stands for ribonucleic acid. It's primary function is to make ribosomes, hence the answer is 'a'
