Step 1: Understanding the Concept:
This is a direct factual question asking to identify the author of the short story 'His First Flight'.
Step 2: Detailed Explanation:
The story 'His First Flight', which is about a young seagull learning to fly, was written by the Irish novelist and short-story writer Liam O'Flaherty. The other authors are famous for different works: Paulo Coelho for "The Alchemist", Roald Dahl for children's books like "Charlie and the Chocolate Factory", and Frederick Forsyth for thrillers like "The Day of the Jackal".
Step 3: Final Answer:
The correct author is Liam O'Flaherty. Therefore, the correct option is (B).