class Fish {
    void swim() {}
}
class Shark extends Fish {}

interface Flyable {}
class Airplane implements Flyable {}

The correct code snippet showing a "Has-A" relationship is option B, where the Computer class contains an instance of the Screen class as a member variable. This composition relationship means that a Computer has a Screen as part of its structure. The other options either show inheritance (A and D) or implementation of an interface (C), none of which represent a "Has-A" relationship.

class Screen {}
class Computer {
    Screen myScreen;
}

class Wheel {}
class Bicycle extends Wheel {}