A.if(a>b) &&(b>c) )k=1;else k=();
B.if((a>b) ||(b>c) )k=1;else k=0;
C.if(a<=b) k=0;else if(b<=c) k=1;
D.if(a>b) k=1;else if(b>c) k=1;else k=0;