Air expands on Heating

Which of the following statement are true (a) Rubber contracts on heating (b) Water expands on freezing (c) Waterr expands on heating from 4^(@)C to 40^(@)C

Solids expand on heating because

The volume of a gas expands on heating.

A solid expands upon heating because

Why do solids expand on heating?

Describe an experiment to show that the solids expand on heating.