单选题：请问以下哪个程序代码体现了对象之间的 **IS-A**关系？

请问以下哪个程序代码体现了对象之间的 **IS-A**关系？



A.java
public interface Color { }
pulic class Shape {
private Color color;
}

B.java
interface Component { }
public class Container implments Component {
private Component[] children;
}

C.java
public class Species { }
public class Animal {
private Species species;
}



答案：B