Which of the following statement is correct according to Clausis statement of second law off thermodynamics?

• A. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
• B. It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
• C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
• D. none of the above