Strengthening Urban Recycling Programs Argument

A recent study conducted by the Environmental Research Institute suggests that recycling rates have increased by 30% over the past decade in urban areas. The study attributes this increase primarily to the implementation of enhanced recycling programs and public awareness campaigns. However, critics argue that the data may not reflect a true increase in overall recycling rates, as the study did not consider rural areas where recycling participation could be significantly lower.

Which of the following statements, if true, would most strengthen the argument that urban recycling programs are effective in increasing overall recycling rates?