The correct answer is A. -c.
The -c option is used to display the number of blocks used by a file. The other options are not valid options for the ls command.
The ls command is used to list the contents of a directory. The -c option is one of the many options that can be used with the ls command. The -c option tells the ls command to display the number of blocks used by each file in the directory.
The number of blocks used by a file is the amount of space that the file takes up on the disk. The number of blocks used by a file is calculated by the operating system. The operating system keeps track of the size of each file and the number of blocks that each file uses.
The -c option is a useful option to use when you want to see how much space a file is using. For example, if you have a large file that you want to delete, you can use the -c option to see how much space the file is using before you delete it.
The -c option is also a useful option to use when you are trying to troubleshoot a problem with a file. For example, if you are trying to figure out why a file is not opening, you can use the -c option to see how many blocks the file is using. If the file is using a lot of blocks, it may be that the file is corrupted.
The -c option is a simple but powerful option that can be used to get information about the files in a directory.