单选题

以下哪一段代码不会抛出异常

Question

A. NSArray *array=@[@1,@2,@3]NSNumber * number=array[3]

B. id value
NSDictionary *dict = @{@"key": value}

C. NSString *str=nilNSString *str2=[str substringFromIndex:3]

D. NSString *str=@"hi"NSString *str2=[str substringFromIndex:3]