The energy of orbitals depends on the principal quantum number or the main shell to a large extent. Hence, orbitals with an equal value of n will have the same levels of energy and will be called degenerate orbitals.

Amongst the given orbitals the degenerate orbitals will be 3d_xy, 3d_z2, 3d_yx because they have the same main shell n = 3.

And 4dxy_, 4d_yx, 4d_zz because they have the same value of n=4.