What happens when Karel executes the 'turnAround' command?

When Karel executes the 'turnAround' command, it performs a rotation of 180 degrees. This means that Karel will face the opposite direction from where it started. This command is particularly useful for navigating back to a previous position without needing to execute two separate turns.

In this scenario, Karel effectively changes its orientation in a straightforward manner, allowing it to efficiently continue its task or maneuver around obstacles. Each of the other options describes different types of turns that cannot achieve the same outcome as the 'turnAround' command. Thus, the option stating that Karel turns 180 degrees accurately represents the action performed by the command.