Mars appears reddish in the night sky due to the presence of iron oxide (rust) on its surface, which reflects sunlight in a way that gives it a red color.
This is why Mars is often called the "Red Planet."
Other Options Explained:
(A) Saturn – Appears yellowish due to its thick atmosphere of ammonia and methane.
(B) Mercury – Appears grayish because of its rocky surface with no atmosphere to scatter light.
(D) Jupiter – Appears whitish with orange and brown bands, due to its gas composition (hydrogen, helium, and ammonia clouds).
Thus, the correct answer is (C) Mars.
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