Prospective buyers asked the licensee representing them if it would be a good idea to check the property they wish to purchase for radon. The licensee's best response would be to tell the buyers that

This statement is misleading because radon levels can vary significantly from one home to another, regardless of the geographic area. Even in regions where radon is generally thought to be low-risk, individual homes can still have high radon concentrations. Therefore, it is not safe to assume radon will not be a problem without testing.

This choice incorrectly minimizes the risk of radon exposure. Radon is harmful to all individuals, regardless of smoking status. While smoking is a major risk factor for lung cancer, radon exposure is a significant risk factor on its own, and non-smokers can still develop lung cancer from radon exposure.

This response is false since radon is odorless and cannot be detected through smell. Relying on sensory detection would lead to a false sense of security. Proper testing is essential to identify radon levels in a property.