Red is used for danger signals because it is:
ALeast suited
BLeast studied
CLeast stressed
DLeast scattered
Answer & Solution
Correct answer: D. Least scattered
1. Fog and smoke scatter light on the way.
2. One colour gets through them best.
3. Red is least scattered by fog or smoke.
_Source: NCERT Class 10 Science, Ch 11 'The Human Eye and the Colourful World'_
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