14 Elements after Actinium are called
Actinides
Lanthanides: 14 elements present after element lanthanum (La) are called lanthanides.
Actinides: 14 elements present after element actinium (Ac) are called actinides.
D-Block Elements: When differentiating electron enters the (n–1)d orbital, then elements of this class are called d-block elements.
P-Block Elements: When differentiating electron enters the p - orbital of the nth orbit, elements of this class are called p-block elements.
Hence, Option (B) is correct