A particular logistics routing protocol used in large distribution networks often leads to shipment delays because packages that normally remain within local sorting hubs tend to be redirected into long-distance transit routes, eventually congesting regional distribution centers. When a routing override system, which counteracts certain effects of the protocol, is implemented along with the protocol, shipment delays occur far less frequently. Therefore, the routing override system probably disables the mechanism by which the protocol causes packages to be redirected into long-distance transit routes.
Which of the following is an assumption on which the argument depends?
A. The routing override system does not directly remove packages once they have entered long-distance transit routes.
B. Factors other than the redirection of packages into long-distance transit routes can cause shipment delays.
C. The routing override system does not reduce overall delivery efficiency.
D. For logistics networks, increased shipment delays are the most harmful effect of using the routing protocol.
E. Distribution networks in which the routing override system but not the routing protocol is used are no more likely to experience shipment delays than networks in which neither system is used.