单项选择题

若有以下说明,则数值为4的表达式是()。inta[12]={1,2,3,4,5,6,7,8,9,10,11,12};charc='a',d,g;

A.a[4]
B.a['d'-c]
C.a[g-c]
D.a['d'-'c']
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