How can Karel collect all beepers in a row?

To collect all the beepers in a row, Karel must continuously check for the presence of a beeper and collect it before moving to the next position. The correct approach involves using a loop that keeps running as long as Karel is next to a beeper.

In the selected answer, Karel first checks if there is a beeper next to it. If there is, it will execute the action to pick up the beeper and then move forward to check for more beepers. This ensures that Karel collects each beeper in its immediate vicinity before moving to the next position. By repeating this process until there are no more beepers nearby, Karel can successfully collect all the beepers in that row.

The other options either fail to properly account for the collection of beepers or do not incorporate the necessary movement logic following the collection. For instance, checking for beepers without collecting them or moving without the proper condition does not accomplish the task of gathering all beepers effectively.