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(A) : All natural radioactive elements are ultimately converted to lead.
(R) : All the elements above lead are unstable.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is B.

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Detailed Solution

Lead has the highest mass no element which has a stable nuclei, mass no more than lead are having an unstable nuclei.

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