What command could be used to rotate Karel to the left?

The command to rotate Karel to the left is indeed "turnLeft();". This command is a standard function in Karel programming that specifically instructs Karel to change its orientation by 90 degrees to the left. When this command is executed, Karel will face a new direction, which is essential for navigating the grid or performing tasks that require specific directional movement.

The other options, while they might sound plausible, are not recognized commands in Karel programming. "rotateLeft();" and "spinLeft();" imply a similar action but are not part of the language's provided methods. Additionally, "leftTurn();" does not match the established terminology used in Karel's command set. Understanding the precise commands and their syntax is crucial for successfully programming Karel to perform various tasks on the grid.