Radon is a health hazard because
(A)it is a gas that can be inhaled and then it may decay to a solid that resides in the lungs (B)it is a gas that is extremely soluble in the bloodstream, and it decays in vital organs (C)it is a gas that enters the body easily and targets the thyroid because it is chemically similar to iodine (D)it is a gas that enters the body easily and targets bones because it is chemically similar to calcium
A