Missing USB-C to Ethernet Network Option

System Information:

Macbook Pro 15-inch, 2016

MacOS Sierra 10.12.4

I do not have a network option for a USB-C to Ethernet connection. I have the following options in the Network Pane when I try to add a network option:

Thunderbolt Bridge

Thunderbolt 14

Thunderbolt 13

Thunderbolt 1(en2)

Thunderbolt 1(en1)

Bluetooth PAN

Wi-Fi

LPSS Serial Adapter (2)

LSPP Serial Adapter (1)

I have a USB-C to Ethernet adapter, plugged in with an ethernet cable, but no option. I can plug it into a colleague's identical MacBook and there's no problem. The USB-C to Ethernet option is there, and she can use ethernet. However, that is not an option on my Mac.