Explanation:

In MS-DOS, the standard command to clear the command prompt screen is `CLS`. Option (a) 'CIS' is not a command. Option (b) 'Clear' is a command used in Unix/Linux, not MS-DOS. Option (d) 'Wipe' is not a screen-clearing command. Option (c) 'Clear screen' describes the *action* of the command but is not the actual command itself. This question's options are flawed as none represent the correct MS-DOS command. However, if forced to select the most conceptually relevant option, 'Clear screen' describes the function, even if it's not the executable command. The factual command is `CLS`.