Answer:
(C)- The computer and the router are not in the same subnet. Release and renew the IP address of the computer.
Step-by-step explanation:
You can't connect to a 10.0.0.1 device that exists outside of your network, meaning that you can't ping or log in to a 10.0.0.1 device unless it resides inside the local network you're using to access it (with the exception of the DDNS).