The correct answer to the question is : D) Thermometre
EXPLANATION:
Thermometre is the device used for measuring the temperature of any substance.
Thermal expansion is the process in which the substance will expand when heat is given to that substance. Thermometre is based on the property of thermal expansion.
Generally, the substance that is used in thermometre is mercury. It expands at a fast rate when a little bit of heat is given to the thermometre.
When the thermometre is connected to any body, the heat will flow from body at high temperature to thermometre. The mercury level rises in the thermometre tube which gives the temperature of that substance under consideration.
Hence, it is the thermometre which is based on thermal expansion.
