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S1: Size of Np^(3+) is greater than Bk^(...

`S_1`: Size of `Np^(3+)` is greater than `Bk^(3+)`.
`S_2`: It is due to lanthanide contraction.

A

Both `S_1 & S_2` are correct

B

`S_1` is correct & `S_2` is wrong

C

`S_2` is correct & `S_1` is wrong

D

Both `S_1 & S_2` are wrong

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