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English Grammar and Communication Skills
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The puzzles that physicists solve are usually those lying about in plain sight,often things so _________ that they are overlooked by all but the keenest observers.
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A
ordinary
💡 Explanation:
The sentence says puzzles are 'lying about in plain sight' but are 'overlooked' - meaning they're not noticed. This creates a paradox: if something is in plain sight, why is it overlooked? The answer is that the puzzles are so 'ordinary' or common that people ignore them despite being visible. 'Hidden' contradicts 'plain sight,' 'vital' doesn't explain why they're overlooked, 'vague' and 'small' don't create the right contrast with being overlooked despite visibility.