How can Karel handle multiple beepers in a single action?

The correct answer highlights that Karel can handle multiple beepers in a single action by using a while loop. This loop allows Karel to repeatedly execute a command until a specific condition is met, such as until there are no more beepers available in the current location. By employing a while loop, Karel can effectively pick up all beepers one by one until the count reaches zero, enabling the handling of multiple beepers in a systematic and efficient manner.

In contrast, options that suggest specific commands like pickMultiple() or collectAll() imply a single-step action that isn't typically defined in Karel's basic command set. The batchProcess() function might suggest batch handling, but it does not align directly with Karel's conventional command methods for interacting with beepers. The use of a while loop is a foundational programming structure that allows for dynamic action, making it the most suitable choice for this scenario.