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Set 3: Command of Evidence (Advanced)

Explanation

Answer: B

PASSAGE

The Fermi Paradox asks: if the universe is vast and old, why have we not detected extraterrestrial civilizations? Proposed explanations include the 'Great Filter' hypothesis—that civilizations inevitably destroy themselves—or that communication is impossible over galactic distances.

What does the 'Great Filter' hypothesis suggest?

A. Aliens are common.
B. Civilizations face an existential barrier to long-term survival.✓ Correct
C. Communication is easy.
D. Earth is the only planet.

Detailed Explanation

'Civilizations inevitably destroy themselves' = existential barrier.

Why others are wrong:

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