You are presented with the question "What are used for two people for communication with sound?" and the following answer choices: 
- cell phones
 - messengers
 - energy
 - megaphones
 - A Greek letter
 - flashlights
 - gramophones
 - electricity

Now knowing that telephones are used for communication by two people by transmitting sound and cell phones are, bottom line, radios with a connection to a telephone company, choose the best answer.


 

 cell phones        