单项选择题

设有定义: int a=1,b=2,c=3;,以下语句中执行效果与其它三个不同的是

A.if(a>b)c=a,a=b,b=c;
B.if(a>b){c=a,a=b,b=c;}
C.if(a>b)c=a;a=b;b=c;
D.if(a>b){c=a;a=b;b=c;}