Assertion :The archaeological studies are based on the radioactive decay of carbon- $14$ isotope. Reason: The ratio of $C - 14$ to $C - 12$ in the animals or plants is the same as that in the atmosphere.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Using the principle of carbon dating, we get that the assertion and reason are both true. It is because of the natural $C^{14} : C^{12}$ ratio that we can date objects. Thus the reason explains the assertion.

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