Answer:
(D) Source 1 and 5
1) A graph showing different types of renewable energy resources and the average cost savings for consumers for each type.
5) A pamphlet from the Department of Energy about making money from a personal renewable energy system
Step-by-step explanation:
This would be one of the most helpful and the reliable sources of information which will help Carol in her assignment. The graph will give the practical idea of the information collected and thus will give the people an example and answer of how the renewable energy save people money.