Set 2: Inferences (Advanced)
Explanation
PASSAGE
The Fermi Paradox asks why, given the age and size of the universe, we haven't detected extraterrestrial civilizations. Proposed explanations range from the 'Great Filter'—suggesting extinction events prevent civilizations from becoming detectable—to the 'Zoo Hypothesis'—proposing advanced aliens deliberately avoid contact. Each solution remains speculative without empirical verification.
What does the variety of explanations suggest?
Detailed Explanation
This question asks you to draw a logical conclusion from the text. Multiple 'speculative' solutions persist = insufficient data to choose among coherent alternatives. A valid inference must be supported by evidence in the passage, even if not stated directly. Look for clues in the text that strongly suggest the answer. Avoid conclusions that require assumptions beyond what's written. Valid inferences are strongly supported by multiple pieces of evidence in the text. Be cautious of choices that go too far beyond what the passage actually states. The best inference is the one most directly supported by textual evidence.
Key Evidence:
• "explanations range from... to..."
• "each solution remains speculative without empirical verification"
Why others are wrong: B ('Speculative' means unresolved.), C (Ongoing proposals indicate continued investigation.), D (Different hypotheses make different assumptions about alien behavior.).