Answer:
All of the above
Step-by-step explanation:
All of these could be sources that might contain research that would support this claim. The sponsor from last year might be able to provide evidence based on his experiences of the previous year. The two brochures can compare the prices of the project to that of similar ones. The newspaper article could provide information about the product and the fundraiser. Therefore, all of these sources would be useful when evaluating the accuracy of the statement.