Heat pump used for heating is a definite advancement over the simple electric heater

Question

. Assertion (A): Heat pump used for heating is a definite advancement over the simple electric heater           

Reason (R): The heat pump is far more economical in operation than electric heater.

1. Both A and R are individually true and R is the correct explanation of A
2. Both A and R are individually true but R is not the correct explanation of A
3. A is true but R is false

         d.A is false but R is true