Assertion: Radioactive wastes are pre-treated and stored in containers 500 m below the earth’s surface

Reason: Nuclear radiation in low doses causes mutations and is lethal in high doses

The correct option is A Both assertion and reason are true and the reason is the correct explanation of assertion
Nuclear radiations in low doses cause mutations and is lethal in high doses. It also creates various disorders and cancers. That is why, it is recommended that radioactive wastes are pre-treated and stored in shielded containers and buried within rocks, about 500 m below the earth’s surface.