Passage Summary: People are asking the British government for their secret UFO files, but the government is saying "no comment," which makes some people think they're hiding proof of aliens.

Conclusion: The government's refusal to share UFO data suggests that alien spacecraft have likely been spotted near Earth.

Reasoning: Security agencies are withholding information and ignoring requests from civilian researchers regarding UFO sightings.

Analysis: The essayist is essentially arguing that if the government is acting like it has something to hide, it probably has a flying saucer in the basement. To bolster this, we need to eliminate the more boring explanations for government secrecy, like protecting experimental aircraft or just general bureaucratic grumpiness. Look for an answer that makes the 'alien' explanation more likely than the 'national security' one.