Identify the incorrect statement among the following:

1. A. Lanthanoid contraction is the accumulation of successive shrinkages.
2. B. As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
3. C. Shielding power of 4f electrons is quite weak.
4. D. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

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