In Mendeleev's periodic table, elements belonging to which of the following groups found a place in the table later?

Correct option is B

In Mendeleev's periodic table, the elements Scandium (Sc), Gallium (Ga), and Germanium (Ge) were not initially discovered, but Mendeleev predicted their existence and properties based on the gaps in his table. Later, these elements were discovered, and their properties matched Mendeleev's predictions, thus filling the gaps. This further validated the accuracy and usefulness of Mendeleev’s periodic classification system.