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radioactive nucleus X undergoes a series...

radioactive nucleus X undergoes a series of decays corroding to the scheme
`X oversetalphararrX_1overset(beta^(-))rarrX_2overset(alpha)rarrX_3overset(gamma)rarrX_4`
If the mass number and atomic number of X are 180 and 72 respectively, the corresponding numbers for `X_4` are

A

17.6 ,69

B

172,69

C

176,71

D

172,71

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The correct Answer is:
B
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