Regarding the magnetic properties of lanthanides and actinides the correct statement is:

Lanthanides are weakly paramagnetic while actinides are strongly paramagnetic.

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Quenching of orbital contribution is greater in lanthanides than in actinides.

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5f electrons in actinides are too diffuse and are less effectively shielded which results in considerable quenching of orbital contribution, and hence the magnetic moments of actinides are significantly less than theoretically predicted values.

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Because of diffused f electrons there is no quenching of orbital contribution towards magnetic moment.

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Solution

The correct option is A 5f electrons in actinides are too diffuse and are less effectively shielded which results in considerable quenching of orbital contribution, and hence the magnetic moments of actinides are significantly less than theoretically predicted values.
Magnetic moments of actinides are significantly less than their theoretically predicted values. This is because electrons of actinides are less effectively shielded which results in quenching of the orbital contribution.

Hence, option C is the correct statement.

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