The correct answer is A. ls.
The ls command is used to list the contents of a directory. It can be used to list the contents of the current directory, or the contents of any other directory. The ls command can also be used to list the contents of a file.
The lp command is used to print a file.
The dir command is used to list the contents of a directory in Windows.
The tar command is used to create, extract, and list archive files.
E is not a valid option.