CompTIA Network+ exam question/answer explanation required!

Tags:
#ipaddress #ipv4
CIDR
Cisco router configuration
Cisco Routers
router
Here's an exam question for which the answer is 'C - incorrect subnet mask'.
I would be grateful if anyone could explain why C is the correct answer?
The question is as follows:
A network administrator configures a router with the following IP address information:
 

Gigabit Ethernet 1 Interface: 10.10.0.1/24 Serial 0 Interface: 10.10.0.253/30

  Clients are connected to a switch on the gigabit Ethernet interface; the ISP is connected to the Serial 0 interface. When the router configuration is complete and client devices are reconfigured, all clients report that they are unable to connect to the Internet. Which of the following is the MOST likely reason?   A. The router was configured with an incorrect IP address B. The router was configured with an incorrect default gateway C. The router was configured with an incorrect subnet mask D. The router was configured with an incorrect loopback address.


Software/Hardware used:
Router configuration, IPV4, CIDR
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