What happens to matter when it is heated?

In general, when the matter is heated, its particles gain kinetic energy and start moving more rapidly, thus, leading to expansion.

Heat makes gases, liquids, and solids to expand. They compress or contract as they cool. When heated, particles move very quickly and are able to spread wider apart, taking up more space, which causes gases and liquids to expand.

For example, when ice is heated, it turns into water and thus expands.

Hence, the correct option is (A).