Answer: The most effective leader behaviour of this approach will be DELEGATING leader approach.
Explanation: The delegating leader is an individual that is exceptionally skilled in the commitment of task to someone especially subordinates. In this method, the subordinates get to make all decisions and choices, which they are then responsible for.
In this question, the leader only needs to instruct them on what to do to set up the camp site, from there, the boys scout are totally responsible for what happens.