Why is the sky orange and red at sunrise and sunset

Due to the red light waves being scattered the least by the molecules in the atmosphere, so when the light travels to our eyes we see mostly red/orange/yellow.

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answer; i believe the correct answer is (c) /// is a homogeneous mixture of gaseous substance nitrogen,oxygen and smaller amounts of other substancesmixtures can be either ( homogeneous or heterogeneous)plz check first good luck