A toxic dumping site leaks into a local water supply and prompts a public outcry. The local and then the state government each take actions to clean up the site and to fine the company for damages. Which of the following would be a potential positive externality for the national environment?. . A. More funds for pro-business political candidates. . B. Increased funding for oceanic research efforts. . C. Renewed interest among students in the humanities. . D. Tighter federal oversight laws and restrictions