What is the command for Karel to turn around?

The command for Karel to turn around is achieved through executing the command to turn left twice in succession. When Karel turns left, it changes its direction by 90 degrees counterclockwise. By turning left two times, Karel effectively makes a 180-degree turn, which is what is meant by "turning around." This is a fundamental movement method in Karel programming, allowing Karel to face the opposite direction.

The other options do not provide a valid command that accomplishes a complete turnaround. While "turnAround();" might seem logical, it is not a recognized command in Karel's programming language. Similarly, "rotate();" and "spin();" do not correspond to any defined Karel commands for turning. Thus, the use of two "turnLeft()" commands is the correct and recognized way to achieve a turnaround for Karel.