Final answer:
c) Transport of proteins within the cell.
Vacuoles and vesicles are involved in storage and the transport of proteins within the cell; vacuoles are larger and store substances, while vesicles transport materials and can fuse with other cellular membranes.
Step-by-step explanation:
Vacuoles and vesicles primarily function in the transport of proteins within the cell and storage. Vacuoles are often used as storage areas and may have secretory, excretory, and storage functions, especially in plant cells where they can be quite large. Vesicles are smaller and involved in the transport of materials both within the cell and to the outside, and they can fuse with other membrane systems like the plasma membrane, endoplasmic reticulum (ER), and Golgi apparatus. Thus, the correct answer to the question is c) Transport of proteins within the cell.