Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The density of the copper $\left({ }_{29}^{64} \mathrm{Cu}\right)$ nucleus is greater than that of the carbon $\left({ }_6^{12} \mathrm{C}\right)$ nucleus.
Reason $(R)$ : The nucleus of mass number $A$ has a radius proportional to $A^{1 / 3}$.
In the light of the above statements, choose the most appropriate answer from the options given below :
Select the correct option:
A
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
B
Both (A) and (R) are correct and (R) is the correct explanation of (A)
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