Predict the Relationship Between the Lattice Energies (U) of KBr

Multiple Choice

Predict the relationship between the lattice energies (U) of KBr and CaO.

A) U_CaO  4 U_KBr because the ionic charges are 2 and 2 and the distance between the ions is smaller.
B) U_CaO  4 U_KBr because the ionic charges are 2 and 2 and the distance between the ions is larger..
C) U_CaO  2 U_KBr because the ionic charges are 2 and 2 and the distance between the ions is smaller.
D) U_CaO  4 U_KBr because the ionic charges are 2 and 2 and the distance between the ions is larger.
E) U_CaO and U_KBr are about the same because the larger ionic charge is compensated by the larger distance between the ions.