Introduction:
In the story, the boy goes for a walk and encounters various animals along the way. The question asks who the boy meets first on his walk. The correct answer is option 'C', which is a cat.

Detailed Explanation:
Meeting the Cat:
- At the beginning of the boy's walk, he comes across a cat sitting on a wall.
- The cat catches the boy's attention with its sharp meow and bright green eyes.
- The boy stops to observe the cat and greets it with a friendly "Hello!"

Why the Correct Answer is Option 'C' (Cat):
- The question specifically asks about the first animal the boy meets on his walk.
- Although there are other animals mentioned in the story, such as a horse, a puppy, and a mand, the boy encounters the cat first.
- The cat is the initial animal encounter described in the story, making it the correct answer.

Other Animal Encounters:
- After meeting the cat, the boy continues his walk and encounters other animals.
- He sees a horse in a field, grazing peacefully.
- Later, he spots a playful puppy bounding towards him, wagging its tail.
- Finally, the boy notices a man walking his dog, a friendly golden retriever.

Conclusion:
In conclusion, the boy meets the cat first on his walk. The cat captures his attention with its meow and green eyes, and he greets it before encountering other animals like the horse, puppy, and man with a dog.

At the beginning of his walk, the boy meets a man.