下面的程序编译运行后,输出的结果是( ). import java.util.Arrays; public class Test { public static void main(String[] unused) { String[] str = {"xxx", "yyy","aaa","bbb"}; Arrays.sort(str); int index=Arrays.binarySearch(str,"aaa"); System.out.println(index); } } A. 0 B. 1 C. 2 D. 3