Which command would you use to move a directory and all of its contents to a new location?

The command used to move a directory and all its contents to a new location is structured as mv source destination. In this case, the source is the directory you want to move, and the destination is the new location where you want to place that directory.

Option C, mv ~/dir1 ~/dir2, is correct because it correctly follows the syntax for the mv command. The command takes ~/dir1, the directory to be moved which is located in the home directory, and moves it to ~/dir2, the target location.

The mv command is capable of moving both files and directories without the need for an additional flag, as long as the right syntax is used. It's important to note that if dir2 does not exist, the mv command will rename dir1 to dir2. In contrast, if dir2 is an existing directory, dir1 will be moved inside it.

In summation, the success of this command hinges on its proper format, which is adhered to in option C, effectively allowing the movement of the specified directory along with all its contents to the desired location.