The Four Spheres Below Represent Na⁺,Mg²⁺,F⁻,and O^2-,not Necessarily in That

Multiple Choice

The four spheres below represent Na⁺,Mg²⁺,F⁻,and O^2-,not necessarily in that order.
-Which sphere most likely represents the Mg²⁺ ion?

A) A
B) B
C) C
D) D