Casey's persuasive speech contained the following statement: The decline in the U.S. bat population has reached critical proportions. Since 2006, more than six million bats in 23 states have been killed by a fungus called white-nose syndrome. The shrinking number of bats has serious consequences, not only because bats eat insects that are harmful to trees and crops, but because they eat mosquitoes, such as those that carry West Nile virus. Which of the three basic issues of persuasive speeches on questions of policy did Casey address in this excerpt