Explanation:

Let’s break it down:

- Option 1: Neptune

- Neptune is a gas giant, not a terrestrial planet. It’s made mostly of gases and ices and sits way out in the solar system.

- Option 2: Mercury

- Mercury is a terrestrial planet. That means it's rocky, small, and close to the Sun—like Earth, Venus, and Mars.

- Option 3: Uranus

- Uranus isn’t terrestrial either. It’s an ice giant, again mostly made up of gases and ices, not solid surface.

- Option 4: Jupiter

- Jupiter is the biggest gas giant. There’s no solid ground to stand on: just clouds, storms, and a lot of atmosphere.

So, the right answer is really clear: