The elements with atomic numbers 101 and
104 belong to, respectively, :

To find where the elements with atomic numbers 101 and 104 belong to from the  given options.

Formula/Concept to be used:

Modern periodic table

Detailed Solution:

The correct option is A Actinoids and Group 4

$\mathrm{Z}=101\text{ has }[\mathrm{Rn}{]}^{86}7{\mathrm{s}}^{2}5{\mathrm{f}}^{13}-\text{ actinoids }$

$\mathrm{Z}=104\text{ has }[\mathrm{Rn}{]}^{86}7{\mathrm{s}}^{2}5{\mathrm{f}}^{14}6{\mathrm{d}}^2-4^{\text{th }}$group elements

The answer is Actinoids & $4^{\text{th }}$ group.

A is the correct option.