Correct Answer:
B. Mars
Mars is famously known as the "Red Planet" because its surface is rich in iron oxide, commonly known as rust. This gives the planet its distinctive reddish-orange hue, visible even from Earth.
- Earth is often called the "Blue Planet" due to the abundance of water covering its surface.
- Venus is known for its extremely hot, dense atmosphere and is sometimes referred to as Earth's "sister planet" due to similar size, but it is not red.
- Jupiter is the largest planet in our solar system, a gas giant characterized by its swirling clouds and the Great Red Spot, but the planet itself is not uniformly red.