What is the principle reason to use a private IP address on an internal network?

What is the principle reason to use a private IP address on an internal network?

A.
Subnet strategy for private companies.

B.
Manage and scale the growth of the internal network.

C.
Conserve public IP addresses so that we do not run out of them.

D.
Allow access reserved to the devices.

Explanation:
This question is to examine the concept of the private IP address.
Class A: 10.0.0.0-10.255.255.255
Class B: 172.16.0.0-172.31.255.255
Class C: 192.168.0.0-192.168.255.255
The three classes of addresses shown above cannot be used on the Internet, they can only be used for the interior LAN addressing scheme. Because of the practical exhaustion of the IPv4 address space, private IP addresses are generated to save the address resources.
The correct answer is C.