为自己加油

给定一个Java程序的代码片断如下:
If(grade==’A’||grade==’B’)
Score=90;
Else if(grade==’C’||grade==’D’)
Score=70;
Else
Score=60;
那一项代码与其很相同的功能。

A.switch(grade){
Case ‘A’:
Case ‘B’:score=90;
Case ‘C’:
Case ‘D’:scpre=70;
Default:score=60;}
B.switch(grade){
Case ‘A’:break;
Case ‘B’:score=90;
Case ‘C’:break;
Case ‘D’:scpre=70;
Default:score=60;break;}
C.switch(grade){
Case ‘B’:score=90;break;
Case ‘D’:scpre=70;break;
Default:score=60;break;}
D.switch(grade){
Case ‘A’:
Case ‘B’:score=90;break;
Case ‘C’:
Case ‘D’:scpre=70;break;
Default:score=60;break;
}