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Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Atomic radius of gallium is higher than that of aluminium. Reason R: The presence of additional 10 d-electrons offer poor screening effect for the outer electrons from increased nuclear charge in gallium. 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 and R is the correct explanation of A.
D
Both A and R are true but R is NOT the correct explanation of A.
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