Which of the following is NOT a terrestrial planet?

Uranus

The correct answer is Option (4) - Uranus

Uranus is NOT a terrestrial planet.

• Venus, Mars, and Earth are all classified as terrestrial planets. They are rocky planets with relatively high densities and solid surfaces.
• Uranus, along with Jupiter, Saturn, and Neptune, is classified as a gas giant. These planets are much larger and less dense than terrestrial planets, primarily composed of hydrogen and helium and lacking a solid surface.

Therefore, Uranus is the only option that is not a terrestrial planet.