Which of the following statement is not correct ?

Options

A. `La(OH)_3` is less basic than `Lu(OH)_3`
B. In lanthanoid series, ionic radius decreases from a `La^(3+)` to `Lu^(3+)`ion.
C. La is actually an element of transition series rather than lanthanoids
D. Atomic radius of Zr and Hf are same because of lanthanoid contraction.