Which command would Karel use to turn around?

To turn around, Karel uses the command that instructs it to face the opposite direction from its current orientation. The command that performs this action is specifically designed for turning Karel 180 degrees, which means it needs to make two consecutive turns to the left or right. In many programming environments, the function named for this action is typically called turnAround().

This command simplifies the process for the programmer by consolidating what would otherwise require two commands (two left turns or two right turns) into a single, clear instruction. As a result, when the goal is for Karel to face the opposite direction quickly and efficiently, using turnAround() is the correct and most efficient choice.