(1) If both Assertion (A) and Reason (R) are True and the Reason \( (\mathrm{R}) \) is a correct...

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(1) If both Assertion (A) and Reason (R) are True and the Reason \( (\mathrm{R}) \) is a correct explanation of the Assertion \( (\mathrm{A}) \).
(2) If both Assertion (A) and Reason (R) are True but Reason (R) is not a correct explanation of the Assertion (A).
(3) If Assertion (A) is True but the Reason (R) is False.
(4) Assertion (A) is False but Reason (R) is True.
Assertion (A): The ratio of the mass of 100 billion atoms of magnesium to the mass of 100 billion atoms of lead can - be expressed as \( \frac{24}{207} \).
Reason (R): Atomic weights are relative masses.
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