The correct response that expresses a theme of the passage is not among the options provided. The passage focuses on the conservation efforts for Peregrine Falcons, particularly the challenges and successes of their recovery from near extinction. A more fitting theme could be related to the importance of conservation and the impact of human efforts on the survival of species.
If I were to provide a suitable option based on the passage's content, it would be something like: "Conservation efforts and habitat restoration are crucial for the survival of endangered species." However, if we must choose from the provided options, none directly relate to the theme of the passage about ornithology and the restoration of the Peregrine Falcon population.