Consider the following statements about Zr and Hf.
I. Radii of Zr and Hf are almost identical.
II It is the consequence of the lanthanoid contraction.
III. Both occur together in nature.
The correct statement (s) is /are (choose the appropriate option)

Options

A. II and III
B. I and II
C. Only II
D. All of these

Answer

D