You are presented with the question "What do telephones allow?" and the following answer choices: 
- consumer-grade invisibility
 - animal transport
 - flow of electrons
 - electromagnetic energy
 - A transportation fuel
 - magic
 - relationships to last distance
 - instant transfer of matter

Now knowing that atelephone is used for communication by humans over long distances and communication is essential if a relationship is to last the distance, choose the best answer.


 

       relationships to last distance  