单选题：给定下列代码，则下列选项中能够正确编译的是哪一个？```abstract class Shape{ int x; int y

给定下列代码，则下列选项中能够正确编译的是哪一个？

```
abstract class Shape{
int x;
int y;
public abstract void draw();
}

@[B](2)

A. ```
abstract class Circle implements Shape{
private int radius;
}
```
B. ```
abstract class Circle extends Shape{
private int radius;
}
```
C. ```
class Circle extends Shape{
private int radius;
public void draw();
}
```
D. ```
class Circle implements Shape{
private int radius;
public void draw();
}
```



A.```
abstract class Circle implements Shape{
private int radius;
}
```
B.```
abstract class Circle extends Shape{
private int radius;
}
```
C.```
class Circle extends Shape{
private int radius;
public void draw();
}
```
D.```
class Circle implements Shape{
private int radius;
public void draw();
}
```


答案：B