Which is a valid Karel command?

In Karel programming, commands must follow specific syntax rules. The correct usage of commands typically involves invoking them in a straightforward manner according to the conventions of Karel's language.

The correct answer utilizes parentheses, which indicates a function call. In the case of Karel, using the command with parentheses (like move()) denotes that you are executing the action of moving forward, which aligns with the syntax used in programming constructs.

Other options either use incorrect capitalization or fail to include the required parentheses. Karel is case-sensitive; therefore, commands written in uppercase (like MOVE) are not recognized as valid. Similarly, using 'move' without parentheses is not the proper way to denote the action in this context, as Karel's structure requires the parentheses to execute the command successfully. Thus, the correct choice captures the necessary syntax for invoking the move command accurately.