The FBI has developed new technology that enables it to listen to conversations in homes from vans parked in the street outside the homes. While listening to conversations in one neighborhood, the FBI uncovers a meth lab. Agents move in and arrest those in the home without a warrant. Which of the following is true?

A. The FBI is required to have a warrant in order to listen to the conversations.
B. The FBI is not required to have a warrant because the information was uncovered without invading the house.
C. The FBI needs a warrant to listen only if it is going to arrest someone.
D. The FBI is not required to have a warrant because the information was uncovered from outside the private property of the individuals involved.