What did Hanscom mean by calling kids "the most effective leaders"?

They are too young to help.

They need to change the world.

They created Earth Overshoot Day.

They can create the most change.

The sentence "the most effective leaders" suggests that Hanscom believes that kids have the potential to be highly influential and impactful in their actions and decisions. Therefore, the correct answer would be: They can create the most change.