Correct Answer:
B. Mars
Mars is famously known as the "Red Planet" due to the prevalence of iron oxide, commonly known as rust, on its surface. This reddish-orange hue is a distinctive characteristic that makes it easily identifiable and has inspired its nickname for centuries. The presence of iron-rich minerals that have oxidized over time gives Mars its iconic color.
- Earth is often called the "Blue Planet" because of its abundant water and oceans.
- Jupiter is a gas giant known for its massive size and prominent Great Red Spot, a persistent storm, but the planet itself is not referred to as the Red Planet.
- Saturn is renowned for its spectacular system of rings, composed mainly of ice particles and rock debris, and is not associated with a red color.