(C) blue
Very fine dust particles scatter light of shorter wavelengths most. Blue light has the shortest wavelength among the given options, so it is scattered the most.
Source: Chapter 10, Section 10.6.1 – Tyndall Effect
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The key principle from the textbook: "Very fine particles scatter mainly blue light" (shorter wavelengths scatter more). This is the basis of the Tyndall effect. Red is scattered the least (which is why danger signals are red). In MCQs, eliminate red, orange, and yellow as they have longer wavelengths and scatter less.