Which Is Not a True Statement About Radon

Which is not a true statement about radon?

A) Radon is caused by the radioactive decay of radon gas found in many rocks such as granite and shale
B) Radon can be found in soil because of the weathering of granite and shale rocks
C) Your home may contain higher levels of radon if it has poor ventilation and specific types of geologic rock such as granite or shale that it is built on
D) The highest levels of radon measured in a home were from Reading Prong that was on a uranium-rich body of granite
E) You can install a radon detector at most hardware stores to help monitor the levels of radon in your home