Explanation :
When your body is warmed by an electric blanket during the winter, this process is said to be an endothermic process. This is because in this process, the heat is absorbed from the blanket and it does not allow to pass out from it.
In the exothermic process, the heat is released in the surrounding.
In the isothermic process, the temperature remains the same.
Hence, the correct option is (A) "endothermic process".