Answer: E) backhauls.
Explanation:
Backhauls are known as the parcel delivery process used by the means of transport by which they collect packages at various stops while also delivering couriers so that the truck is not empty upon return.
For example, a truck must take a package from point A to point B, on the way to point B it picks up a 2nd package, after delivering the 1st package at point B it carries the 2nd package back to point A. Therefore the truck was never empty throughout the journey.
I hope this information can help you.