Which of the following statement is correct regarding transfer of heat?

Heat flows from a hotter object to a colder object.

The correct answer is option 3. Heat flows from a hotter object to a colder object.

Heat naturally moves from regions of higher temperature to regions of lower temperature until thermal equilibrium is reached. This process is based on the second law of thermodynamics, which states that heat energy tends to disperse or equalize in a system over time.