The answer is c.
Radon is a naturally occurring radioactive gas and has been identified as a leading cause of lung cancer, second only to cigarette smoking in the United States. EPA's most recent health risk assessment estimates that 20,000 lung cancer deaths each year are due to radon. You can't see or smell radon because it is a colorless, odorless gas. The only way to know whether radon exists in elevated levels in your home, and to protect your family from radon, is to TEST!
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