单选题：以下程序的执行结果是#includeintmain(){inta=，b=，x，y;x=*a++;y=–b*;printf(“a=%d，x=%dn”，a，x);printf(“b=%d，y=%dn”，b，y);return;}Aa=，x=b=，y=Ba=，x=b=，y=Ca=，x=b=，y=D以上均不对