An environmental group claims that a local chemical plant is polluting a nearby river. they are calling for a shutdown of the chemical plant. what evidence would you the most in evaluating the claim. a. a repeated study that shows chemicals produced by the plant are in water harming fish or other wild life. b. the credentials of the president of the environmental group. c. a report that lists the chemicals they claim are being leaked into the river. d. the url of the environmental group website.