Answer:
B. A summary of the findings and an interview with the group collecting the responses.
Step-by-step explanation:
The supportive claim that most people feel hopeful about the future of the economy is the summary of findings and interviews. The summary of findings and interviews with their responses will serve as a supportive claim.
The findings and interviews will contain their responses and reactions to how they feel about the future of the economy.
Therefore, option B is correct.