9. Look at the four numbers that indicate where the following sentence could be added to the passage.
"On the contrary, they have an obligation to use the commons in ways that are compatible with or do not detract from other uses."
The air into which secondhand noise is emitted and on which it travels is “a commons.” (1) It belongs not to an individual person or a group, but to everyone. (2) People, businesses, and organizations, therefore, do not have unlimited rights to broadcast noise as they please, as if the effects of noise were limited only to their private property.(3) Those that disregard the obligation to not interfere with others’ use and enjoyment of the commons by producing noise pollution are, in many ways, acting like a bully in a school yard. (4) Although they may do so unknowingly, they disregard the rights of others and claim for themselves rights that are not theirs.