Answer :
One system must have higher kinetic energy than the other system is the correct statement.
What is conduction?
Conduction is the process by which heat is transmitted through the material of a substance when there is a difference of temperature between two bodies.
So we can conclude that One system must have higher kinetic energy than the other system is the correct statement.
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Heat flow by conduction requires that the two systems must not be touching each another.
What is heat energy?
Heat energy is a form of energy that exists due to a temperature difference between two objects.
Heat energy flows from an object at higher temperature to an object at a lower temperature.
Heat transfer by conduction involves the vibration of particles of the medium transferring heat due to contact between the two objects.
Therefore, heat flow by conduction requires that the two systems must not be touching each another.
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