Statement I: The actinide contraction is more as compared to the lanthanide contraction.
Statement II: 5f electrons have much lower shielding effect as compared to 4f electrons because 5f orbitals are more diffused than 4f orbitals. 

Options

A. If both Statement I and Statement II are true and Statement II is the correct explanation of Statement I.
B. If both Statement I and Statement II are true but Statement II is not the correct explanation for Statement I.
C. If Statement I is true but Statement II is false.
D. If Statement I is false but Statement II is true.

Answer

A