I believe C is the answer.
Answer:
A circular network happens when you have two (or more) routes to the same controller. Typically, the routes are BACnet/IP and BACnet/Ethernet and both are communicating on both networks. This could happen with BACnet MS/TP although it is rare.
Explanation:
I’d go with b. egotistical, i’m not entirely sure though. It seems like he is trying to appeal to the suspects EGO