One source of background radiation is

Radiations from surrounding planets

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Plastic wastes that human beings generate

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Sewage

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Radioelements like C¹⁴ and K⁴⁰ present in human beings

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Solution

The correct option is D
Radioelements like C¹⁴ and K⁴⁰ present in human beings

Source of background radiation is potassium (K-40) present inside our body.

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