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B
a-1; b-2; c-3; d-4
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C
a-4; b-3; c-2; d-1
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D
a-3; b-2; c-1; d-4
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Solution
The correct option is A a-2; b-3; c-4; d-1 Red has wavelength in 650-700 nm Yellow has wavelength in 550-600nm Green has wavelength in 500-550nm Blue has wavelength in 450-500nm