20. The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animalcells. The most reasonable explanation for this observation is that ____.
(A) plant cells contain a large vacuole that increases the volume of the cell.
(B) plant cells are capable of having a much higher surface-to-volume ratio than animal cells.
(C) plant cells have a much more highly convoluted (folded) plasma membrane than animal cells.
(D) animal cells are more spherical, while plant cells are elongated.
(E) the basic functions of plant cells are very different from those of animal cells.