Which of the following factor may be regarded as the main cause of lanthanoids contraction? (a) ...

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Which of the following factor may be regarded as the main cause of lanthanoids contraction?
(a) Poor suielding of one of the \( 4 f \)-electrons by another in the subshell.
(b) Effective shielding of one of the \( 4 f \)-electrons by another in the subshell.
(c) Poorer shielding of \( 5 d \)-electrons by \( 4 f \)-electrons.
(d) Greater shielding of \( 5 d \)-electrons by \( 4 f \)-electrons.
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