Correct Answer:
B. Sky
The correct answer is Sky. This analogy establishes a relationship between an animal and its primary environment or medium of movement.
- A fish lives and moves predominantly in water. Water is its natural habitat and the medium through which it navigates and survives.
- Similarly, a bird lives and moves predominantly in the sky. While birds may perch on trees or land, their defining characteristic and primary mode of locomotion is flight, which occurs in the sky.
Let's consider the other options:
- Land: While some birds walk on land, it's not their primary domain in the same way water is for fish.
- Nest: A nest is a structure built by a bird, not its primary environment.
- Tree: A tree is a place where a bird might rest or build a nest, but not its primary medium of movement like the sky.
Therefore, the most fitting completion for the analogy, maintaining the "animal : primary environment/medium" relationship, is "Bird : Sky."