Which of the options below arranges the given ions in order of decreasing ionic radius? F⁻, Mg²⁺, O²⁻
a) F⁻ < Mg²⁺ < O²⁻
b) O²⁻ < Mg²⁺ < F⁻
c) Mg²⁺ < F⁻ < O²⁻
d) O²⁻ < F⁻ < Mg²⁺