Question

1. what is an advantage of forced air heating?

○ it is energy efficient.
○ it requires little energy to run.
○ it cleans the air.

Explanation:

For forced air heating systems, one of their advantages is that they can filter and clean the air (through air filters in the system), while "energy efficient" is not a primary advantage of forced - air heating compared to some other heating systems, and "requires little energy to run" is inaccurate as forced - air systems (especially with blowers) do consume a notable amount of energy to operate. So the correct option is the one stating it cleans the air.

Answer:

It cleans the air.