Why do we need to use "sudo" with "apt install" to add software packages to a computer system?

$$A$.$ We need to use "sudo" $($superuser do$)$ for security reasons because "apt install" changes the system by adding new software.

$$B$.$ We never need "sudo" to run apt.

$$C$.$ The "apt" program cannot be used with "sudo" for security reasons.

$$D$.$ We always need to use "sudo" before using "apt", regardless of installing, removing, or simply listing software packages within a computer system.