When Organelles Such as Mitochondria and Vesicles Bind to Microtubules

When organelles such as mitochondria and vesicles bind to microtubules to travel toward axon terminals, they move at a rate

A) substantially slower than the background movement of cytoplasm.
B) about the same as the background movement of cytoplasm.
C) substantially faster than the background movement of cytoplasm.
D) substantially slower than transport to the cell body.
E) substantially faster than transport to the cell body.