public class OuterTest {

	public static void main(String args[]) {

		Airplane airplane = new Airplane(); //line 5
		Airplane.BlackBox box = airplane.new BlackBox(); // line 6
		box.printVariables();

	}
}

 class Airplane {
	String code = "11";

	class BlackBox {
		String code = "22";

		public void printVariables() {
			System.out.print(code); // line 19
 		        System.out.print(Airplane.this.code); // line 20

		}
	}

}
                                

A  Compile error because of lines 5-6 (incorrect instantiation)

B  Compile error because of line 20 (can't access Airplane's variables)

C  2222

D  1111

E  2211