Answer: Option (a) is the correct answer.
Explanation:
When two substances of different temperatures are in contact with each other then transfer of heat takes place from a hotter substance to the colder substance. This process is called conduction.
For example, a pan placed on the stove burner then heat will transfer from stove burner to the pan.
When a fluid (liquid or gas) is heated then more denser (cold) material will sink at the bottom whereas less denser (hot) material will rise at the top. This process is known as convection.
For example, boiling of rice in a pot filled with water.
Radiation is defined as the transfer of wave-like motion of heat energy through an empty space.
For example, heating of a metal plate by radiations from the Sun.
Thus, we can conclude that the transfer of heat from a stove burner to a pan on the burner called conduction.
