Choose the correct options for the following statements :

A) First law of thermodynamics specifies the conditions under which a body can use its heat energy to produce the work.

B) Second law of thermodynamics states that heat always flows from hot body to cold body by itself.

First law of thermodynamics just states that $dQ = dW + dU$.

It does $not$ tell us whether the process is feasible or not neither does it provide any condition to under which the body uses any energy.

Hence, A is false.

Second law of thermodynamics states that heat always flows from hot body to cold body by itself and for heat to flow from a cold body to hot body, external work should be done.

Thus, B is true.