Option (i) is the answer.

In every atom with more than one electron shell, this effect, known as the screening effect, describes the decrease in attraction between an electron and the nucleus. The shielding effect experienced by the outermost electrons increases as the number of electron shells increases. As the screening effect of orbitals reduces from s-orbital to f-orbital in an atom due to the geometry of the orbital, it follows the order s >p > d>f.