A recent analysis of consumer behavior has shown that shoppers are increasingly prioritizing eco-friendly products. Companies producing eco-conscious goods claim that their sales growth directly correlates with this consumer trend. However, some industry experts argue that other factors, such as quality and price, may play a more significant role in purchasing decisions. To further support their claim, the companies have noted that they have invested in sustainable practices.
Which of the following, if true, would most strengthen the companies' argument that the rise in eco-friendly product sales is due to consumer prioritization of sustainability?