Experts I wanted to ask 12th question - Chemistry -

Question

Experts
I wanted to ask 12th question
I cropped the pic but it didn't get crop
Please explain that

Mehvash Shams · Accepted Answer

Dear student, The polarizing power of a cation depends on the
charge /size ratio of the cation Greater is ratio, more is the
polarizing power of the cation Now, the increasing order of sizes
of given cations is: Be2+ < Mg2+ < Ca2+ < K+ and the order
of charge on the cations is: K+ < Ca2+ = Mg2+ = Be2+ Therefore,
order of charge to size ratio is: K+ < Ca2+ < Mg2+ < Be2+
Thus, the increasing order of polarizing power is: K+ < Ca2+
< Mg2+ < Be2+(option c)