离子晶体稳定性取决于晶体中晶格能的大小。判断KCl、NaCl、CaO、BaO四种晶体稳定性由高到低的顺序是

A．KCl＞NaCl＞BaO＞CaO	B．NaCl＞KCl＞CaO＞BaO
C．CaO＞BaO＞NaCl＞KCl	D．CaO＞BaO＞KCl＞NaCl