C. both a and b
Based on my knowledge of energy conversation, Both A (Manufactures can increase a light bub's....) and B ( Energy can be conserved by turning off light when they.....) which makes you C the correct statement.
Researching is the answer
Hi I believe it’s join occupation hope this helped
Answer:
Cost.
Inefficient Policies
Problems of the Euro
Pressure towards austerity
Net migration