Fact 1: Electricity sometimes is used for heating buildings.

Fact 2: Most electricity is created with a turbine generator.

Given the two facts above, answer the question "What are most buildings heated with?" with the following options: 
- a hydraulic system
 - electromagnetic energy
 - compound of hydrogen oxygen
 - Movement of an air mass
 - cellulose
 - turbine generators
 - lowered energy cost
 - direct energy


 

      turbine generators   