_____ may sometimes be necessary to connect multiple devices to the same modem, but all devices will have the same IP address once connected.

A. Technicians
B. links
C. Hypertext
D. Routers

D. Routers

is this right

Yes, that is correct. Routers are responsible for assigning IP addresses to devices on a network and managing the traffic between them. If multiple devices are connected to the same modem, they will all have the same public IP address, but the router will assign them unique private IP addresses to communicate within the local network.