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Given below are two statement : one is l...

Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Size of `Np^( 3 +)` ion is greater than `Bk^(3 + )` ion.
Reason R: The above is a consequence of the lanthanoid contraction.
In the light of the above statements, choose the correct answer from the options given below :

A

A is true but R is false

B

A is false but R is true

C

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

D

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

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