Select the solid.
A: air inside a soccer ball
B: vinegar
C: water in a sink
D: ruler
A ruler is a solid. A solid has a size and shape of its own. If you put a ruler in a box, the ruler will keep its shape.
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.
Vinegar is a liquid. A liquid takes the shape of any container it is in. If you pour vinegar into a different container, the vinegar will take the shape of that container. But the vinegar will still take up the same amount of space.
The water in a sink is a liquid. A liquid takes the shape of any container it is in. If you move the water from a sink into a different container, the water will take the shape of that container. But the water will still take up the same amount of space.