How do you define the boundaries of Karel's world?

Defining the boundaries of Karel's world primarily involves establishing the grid size during the program setup. This setting determines the size and shape of the environment in which Karel operates, defining the maximum extent of movement both horizontally and vertically. By setting specific values for rows and columns, you create a structured area where Karel can navigate, ensuring that the robot has a defined space within which it can execute its tasks and follow commands.

The other options do not effectively create a defined environment for Karel. Randomly placing walls does not provide a consistent framework or predictable limits for Karel’s movement. Limiting the number of moves is not an inherent way to define the physical space of Karel’s world; it merely restricts how far Karel can go without altering the dimensions of the grid itself. Lastly, defining special commands to restrict movement may influence Karel's actions but does not set the foundational boundaries of the world in which it operates. Therefore, setting limits on the grid size is the essential method for defining Karel's world.