Identify the incorrect statement among the following.
- ALanthanoid contraction is the accumulation of successive shrinkages.
- BAs a result of lanthanoid contraction,the properties of $4d$ series of the transition elements have no similarities with the $5d$ series of elements.
- CShielding power of $4f$ electrons is quite weak.
- DThere is a decrease in the radii of the atoms or ions as one proceeds from $La$ to $Lu$.
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