Police Used a Thermal Imager to Scan Kyllo's Home Because

Police used a thermal imager to scan Kyllo's home because they had information that he was growing marijuana in his home.Officers did not have a warrant and claimed the search was in plain view.The Supreme Court ruled that:

A) use of a thermal imager did not alter the fact that the officers observed the marijuana in plain view.
B) use of a thermal imager to explore details of a home that in the past would have been unknown without a physical intrusion into the home is a search and subject to Fourth Amendment requirements.
C) thermal imagers are common devices and,therefore,the search was in plain view.
D) the use of a thermal imager is always illegal.