单项选择题

下面程序的功能是统计字符串中“array”的个数,在程序的空白处应填入的正确选项是
public class FindKeyWords
 public static void main(String[]args)
  String text="An array is a data structur that stores a collection of"
        +"values of the same type. You access each indMdual value"
        +"through an integer index. For example,if a is an array"
        +"of inergers,then a[i]is the ith integer in the array.";
  int arrayCount=0;
  int index=-1;
  String arrayStr="array";
  index=text.indexOf(arrayStr);
  while(index>=0)
   ++arrayCount;
   index+=arrayStr.length();
   index=text.indexOf(arrayStr,index);
  
  System.out.println("the text contains"+arrayCount+"arrays");
 

A.<
B.=
C.<=
D.>=