Final answer:
The logical conclusion is that some sort of wreckage is being kept at a local army base, and the nature of the wreckage is unknown. The army is refusing to disclose any information about it.
Step-by-step explanation:
The logical conclusion based on the last three paragraphs of the passage is option A) Some sort of wreckage is being kept at a local army base. The army refused to comment about it. It is unclear what the wreckage is or what its significance may be.
The passage mentions that the reporter saw the remains of a large, saucer-shaped craft with damage consistent with a missile attack inside a hangar at the army base. The army spokesperson refused to talk about it and told the reporter to 'mind his own business'. Therefore, it suggests that something unusual or secret is being kept at the base.
The passage does not provide enough information to conclude if the wreckage is a UFO or not, and the army's refusal to disclose information suggests that they have the right to keep some programs secret.