Which of these statements explains a key difference between unicellular and multicellular organisms?

A)Only multicellular organisms can photosynthesize
B)The cells of unicellular organisms are much smaller than the cells of multicellular organisms.
C)Multicellular organisms have cell walls that provide structure and support for their cells, but unicellular organisms do not.
D)Multicellular organisms have membrane bound organelles that carry out specific functions.