The FBI Has Developed New Technology That Enables It to Listen

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. Under the Kyllo case:

A) the FBI is not required to have a warrant because the information was uncovered without invading the house.
B) the FBI is not required to have a warrant because the information was uncovered from outside the private property of the individuals involved.
C) the FBI is required to have a warrant in order to listen to the conversations.
D) the FBI needs a warrant to listen only if it is going to arrest someone.
E) None of the above