Select the solid.

 - knife
 - vinegar
 - water droplets
 - water from a faucet
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.
Water droplets are a liquid. A liquid takes the shape of any container it is in. If you collect water droplets in a bucket, they will take the shape of the bucket. But the water droplets will still take up the same amount of space.
A knife is a solid. You can bend a knife. But it will still have a size and shape of its own.
The water from a faucet is a liquid. A liquid takes the shape of any container it is in. If you put water from a faucet into a container, the water will take the shape of that container. But the water will still take up the same amount of space.