To move to the roots of a plant, a sugar molecule must exit the cell where it was produced and enter the stream of plant fluid that carries sugar to other parts of the plant (known as phloem). A newly created sugar molecule is transported to the phloem through diffusion. This means that sugar molecules:. A. Move completely randomly until by accident they exit the cell and enter the phloem.
B. Travel away from the cell organelle (the chloroplast), where they are produced, until they enter the phloem
C. Travel away from areas of the cell with high concentrations of sugar, such as the chloroplast, until they enter the phloem
D. Move randomly until they encounter the phloem, and then stop moving as they are carried along by the phloem to the roots.