Relative change in the radii of two consecutive orbitals does not depend on Z.
Relative change in the radii of two consecutive orbitals varies as 1/n.
Relative change in the energy of two consecutive orbitals varies as 1/n³
Relative change in the angular momenta of two consecutive orbitals varies as 1/n.
r = r₀(n²/Z)
Δr = 2n/Z
Since Δn = 1, Δr α 1/n
L = nħ/2π
ΔL = Δn ħ/2π
ΔL α 1/n
Answer is ABD.