Which of the Following Statements Is Correct According to Clausius

Which of the following statements is correct according to Clausius statement of second law of thermodynamics?

A) it is impossible 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