Final answer:
The states of matter present in the sealed container are solid and gas.
Step-by-step explanation:
The three states of matter are solid, liquid, and gas. In this sealed container, the presence of more than one state of matter can be determined by observing the properties of each state. If the sealed container contains a substance with a fixed shape and volume, it indicates the presence of a solid. If the substance takes the shape of the container but has a fixed volume, it indicates the presence of a liquid. If the substance expands to fill the container and has no fixed shape or volume, it indicates the presence of a gas.
In this case, if the sealed container contains both a substance with a fixed shape and a substance that expands to fill the container, it means that both solid and gas states of matter are present in the container. Therefore, the correct answer is A. solid and gas.