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A redioctive nucleus decays as follows :...

A redioctive nucleus decays as follows :
`Xoverset(alpha)(to)X_(1)overset(beta)(to)X_(2)overset(alpha)(to)X_(3)overset(alpha)(to)X_(4)`
If the atomic number and the mass number of X are 72 and 180 then the mass number and atomic number of `X_4` are-

A

`172, 70`

B

`171, 69`

C

`172, 69`

D

`172, 68`

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The correct Answer is:
B
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