Which one of the following statements is not correct? (A) \( \mathrm{Zr} \) and \( \mathrm{Hf} \...

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Which one of the following statements is not correct?
(A) \( \mathrm{Zr} \) and \( \mathrm{Hf} \) have nearly same atomic size
(B) In \( 3 d \)-series, the atomic radii increase gradually
(C) \( \mathrm{Al} \) and Ga have nearly same atomic size
(D) In lanthanide series, there is gradual decrease in atomic radii of the elements
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