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Which of the following is TRUE about radon?

A

Radon is a colorless, odorless gas that is formed by the incomplete combustion of fossil fuels.

B

Radon is used as insulation in buildings.

C

Radon is the leading cause of lung cancer.

D

Radon is sprayed on furniture as a fire retardant.

E

Radon is a colorless, odorless gas that is emitted naturally from bedrock.

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