Select the solid.

 - marbles
 - rain
 - coffee
 - air inside a soccer ball
Coffee is a liquid. A liquid takes the shape of any container it is in. If you pour coffee into a different container, the coffee will take the shape of that container. But the coffee will still take up the same amount of space.
A marble is a solid. A solid has a size and shape of its own. A marble can be made of clear or colored glass.
The air inside a soccer ball is a gas. A gas expands to fill a space. The air fills all the space inside the soccer ball. If air leaks out, it will expand into the space around the ball.
Rain is a liquid. A liquid takes the shape of any container it is in. If you put rainwater into a bucket, the rainwater will take the shape of the bucket. But the rainwater will still take up the same amount of space.