Identify all the correct statements for Lanthanide contraction. (A) The covalent properties of the lanthanide metal hydroxides increases from La to Lu. (B) The chemical reactivity decreases from La to Lu. (C) La(OH)$_3$ is more basic than Lu(OH)$_3$. (D) Zr and Hf have about the same radius. (E) Separation of lanthanides from one another is easy.