Question-​

Dear Student,

The correct answer for the given question is option (c) , 0.225 - 0.414.

0.225 is the limiting radius ratio for structures having coordination number 4.
0.414 is the limiting radius ratio for structures having coordination number 6.

The range of radius ratio for structures having coordination number 4 is 0.225-0.414.

Hope it helps.

Regards