Which command allows Karel to move forward one square?

The command that allows Karel to move forward one square is indeed "move()". This command is a fundamental part of Karel's programming language, specifically designed to instruct Karel to advance from its current position into the next square in the direction it is facing.

When you call the move() command, Karel checks its current orientation and moves forward by one square accordingly. This is essential for navigation, as moving forward is a primary action that enables Karel to perform tasks and reach various locations on the grid.

Other commands like “moveForward()” or “advance()” might seem intuitive but they do not exist in Karel's command set. Simpler and clearer naming conventions are favored in programming to maintain ease of understanding, which is why the command is simply "move()". The choice of the word "go()" is also misleading in this context since it might imply movement but does not specifically correlate to Karel's movement action.

Thus, "move()" is the correct and standard method used for Karel to execute a forward movement by one square.