Question

which of the following is the best way to prevent radon gas in homes?
sealing cracks
creating cracks
using room fresheners
closing doors

Explanation:

Radon is a radioactive gas that can seep into homes from the ground. Sealing cracks in the foundation and floors helps prevent radon from entering. Creating cracks would allow more radon in. Room - fresheners and closing doors do not address the entry of radon gas.

Answer:

Sealing cracks